diff --git a/admin/tool/admin_presets/classes/output/presets_list.php b/admin/tool/admin_presets/classes/output/presets_list.php
index c1dc56bb990..c071fac13ab 100644
--- a/admin/tool/admin_presets/classes/output/presets_list.php
+++ b/admin/tool/admin_presets/classes/output/presets_list.php
@@ -89,7 +89,6 @@ class presets_list implements renderable, templatable {
                 $actionsmenu = new \action_menu();
                 $actionsmenu->set_menu_trigger(get_string('actions'));
                 $actionsmenu->set_owner_selector('preset-actions-' . $preset->id);
-                $actionsmenu->set_alignment(\action_menu::TL, \action_menu::BL);
 
                 $loadlink = new \moodle_url('/admin/tool/admin_presets/index.php', ['action' => 'load', 'id' => $preset->id]);
                 $actionsmenu->add(new \action_menu_link_secondary(
diff --git a/admin/tool/analytics/classes/output/models_list.php b/admin/tool/analytics/classes/output/models_list.php
index be1cb664949..e1b7b9faee7 100644
--- a/admin/tool/analytics/classes/output/models_list.php
+++ b/admin/tool/analytics/classes/output/models_list.php
@@ -65,7 +65,7 @@ class models_list implements \renderable, \templatable {
 
         $newmodelmenu = new \action_menu();
         $newmodelmenu->set_menu_trigger(get_string('newmodel', 'tool_analytics'), 'btn btn-secondary');
-        $newmodelmenu->set_alignment(\action_menu::TL, \action_menu::BL);
+        $newmodelmenu->set_menu_left();
 
         $newmodelmenu->add(new \action_menu_link(
             new \moodle_url('/admin/tool/analytics/createmodel.php'),
@@ -191,7 +191,6 @@ class models_list implements \renderable, \templatable {
             $actionsmenu = new \action_menu();
             $actionsmenu->set_menu_trigger(get_string('actions'));
             $actionsmenu->set_owner_selector('model-actions-' . $model->get_id());
-            $actionsmenu->set_alignment(\action_menu::TL, \action_menu::BL);
 
             $urlparams = ['id' => $model->get_id(), 'sesskey' => sesskey()];
 
diff --git a/admin/tool/componentlibrary/docspage.php b/admin/tool/componentlibrary/docspage.php
index debbd082885..b9bfe5b47ba 100644
--- a/admin/tool/componentlibrary/docspage.php
+++ b/admin/tool/componentlibrary/docspage.php
@@ -89,7 +89,6 @@ if (get_config('core', 'allowthemechangeonurl')) {
     $thememenu = new action_menu($menuthemes);
     $thememenu->set_menu_trigger($PAGE->theme->name, 'nav-link');
     $thememenu->set_owner_selector('change-moodle-theme');
-    $thememenu->set_alignment(\action_menu::TL, \action_menu::BL);
     $PAGE->set_headingmenu($OUTPUT->render($thememenu));
 }
 
diff --git a/admin/tool/dataprivacy/classes/output/crud_element.php b/admin/tool/dataprivacy/classes/output/crud_element.php
index 738f9b8c85a..07b09f9fdc1 100644
--- a/admin/tool/dataprivacy/classes/output/crud_element.php
+++ b/admin/tool/dataprivacy/classes/output/crud_element.php
@@ -71,7 +71,6 @@ abstract class crud_element {
         $actionmenu = new \action_menu();
         $actionmenu->set_menu_trigger(get_string('actions'));
         $actionmenu->set_owner_selector($elementname . '-' . $exported->id . '-actions');
-        $actionmenu->set_alignment(\action_menu::TL, \action_menu::BL);
 
         $url = new \moodle_url('/admin/tool/dataprivacy/edit' . $elementname . '.php',
             ['id' => $exported->id]);
diff --git a/admin/tool/dataprivacy/classes/output/data_registry_page.php b/admin/tool/dataprivacy/classes/output/data_registry_page.php
index 2f12f589ede..e861e80ee2b 100644
--- a/admin/tool/dataprivacy/classes/output/data_registry_page.php
+++ b/admin/tool/dataprivacy/classes/output/data_registry_page.php
@@ -87,7 +87,6 @@ class data_registry_page implements renderable, templatable {
         $actionmenu = new \action_menu();
         $actionmenu->set_menu_trigger(get_string('edit'), 'btn btn-primary');
         $actionmenu->set_owner_selector('dataregistry-actions');
-        $actionmenu->set_alignment(\action_menu::TL, \action_menu::BL);
 
         $url = new \moodle_url('/admin/tool/dataprivacy/categories.php');
         $categories = new \action_menu_link_secondary($url, null, get_string('categories', 'tool_dataprivacy'));
diff --git a/admin/tool/dataprivacy/classes/output/data_requests_table.php b/admin/tool/dataprivacy/classes/output/data_requests_table.php
index af33f98904d..929ad178f10 100644
--- a/admin/tool/dataprivacy/classes/output/data_requests_table.php
+++ b/admin/tool/dataprivacy/classes/output/data_requests_table.php
@@ -285,7 +285,6 @@ class data_requests_table extends table_sql {
         $actionsmenu = new action_menu($actions);
         $actionsmenu->set_menu_trigger(get_string('actions'));
         $actionsmenu->set_owner_selector('request-actions-' . $requestid);
-        $actionsmenu->set_alignment(\action_menu::TL, \action_menu::BL);
         $actionsmenu->set_constraint('[data-region=data-requests-table] > .no-overflow');
 
         return $OUTPUT->render($actionsmenu);
diff --git a/admin/tool/dataprivacy/classes/output/my_data_requests_page.php b/admin/tool/dataprivacy/classes/output/my_data_requests_page.php
index b82579f8afb..14d637578d7 100644
--- a/admin/tool/dataprivacy/classes/output/my_data_requests_page.php
+++ b/admin/tool/dataprivacy/classes/output/my_data_requests_page.php
@@ -153,7 +153,6 @@ class my_data_requests_page implements renderable, templatable {
                 $actionsmenu = new action_menu($actions);
                 $actionsmenu->set_menu_trigger(get_string('actions'));
                 $actionsmenu->set_owner_selector('request-actions-' . $requestid);
-                $actionsmenu->set_alignment(\action_menu::TL, \action_menu::BL);
                 $item->actions = $actionsmenu->export_for_template($output);
             }
 
diff --git a/admin/tool/policy/classes/output/page_managedocs_list.php b/admin/tool/policy/classes/output/page_managedocs_list.php
index d69680789cf..9123cb8aef1 100644
--- a/admin/tool/policy/classes/output/page_managedocs_list.php
+++ b/admin/tool/policy/classes/output/page_managedocs_list.php
@@ -182,7 +182,6 @@ class page_managedocs_list implements renderable, templatable {
 
         $actionmenu = new action_menu();
         $actionmenu->set_menu_trigger(get_string('actions', 'tool_policy'));
-        $actionmenu->set_alignment(action_menu::TL, action_menu::BL);
         $actionmenu->prioritise = true;
         if ($moveup) {
             $actionmenu->add(new action_menu_link(
diff --git a/contentbank/view.php b/contentbank/view.php
index 25e036883b4..2f874551774 100644
--- a/contentbank/view.php
+++ b/contentbank/view.php
@@ -76,7 +76,6 @@ $PAGE->set_pagetype('contentbank');
 
 // Create the cog menu with all the secondary actions, such as delete, rename...
 $actionmenu = new action_menu();
-$actionmenu->set_alignment(action_menu::TR, action_menu::BR);
 if ($contenttype->can_manage($content)) {
     // Add the visibility item to the menu.
     switch($content->get_visibility()) {
diff --git a/course/format/classes/output/local/content/cm/controlmenu.php b/course/format/classes/output/local/content/cm/controlmenu.php
index 736c37cd06a..37636dcbe11 100644
--- a/course/format/classes/output/local/content/cm/controlmenu.php
+++ b/course/format/classes/output/local/content/cm/controlmenu.php
@@ -125,7 +125,6 @@ class controlmenu implements renderable, templatable {
 
         // Convert control array into an action_menu.
         $menu = new action_menu();
-        $menu->set_alignment(action_menu::TR, action_menu::BR);
         $icon = $output->pix_icon('i/menu', get_string('edit'));
         $menu->set_menu_trigger($icon, 'btn btn-icon d-flex align-items-center justify-content-center');
 
diff --git a/course/renderer.php b/course/renderer.php
index 699eb94764c..124e245023b 100644
--- a/course/renderer.php
+++ b/course/renderer.php
@@ -253,7 +253,6 @@ class core_course_renderer extends plugin_renderer_base {
         $menu = new action_menu();
         $menu->set_owner_selector($ownerselector);
         $menu->set_constraint($constraint);
-        $menu->set_alignment(action_menu::TR, action_menu::BR);
         $menu->set_menu_trigger(get_string('edit'));
 
         foreach ($actions as $action) {
diff --git a/customfield/classes/output/management.php b/customfield/classes/output/management.php
index c6e74174dea..5bbec0ac988 100644
--- a/customfield/classes/output/management.php
+++ b/customfield/classes/output/management.php
@@ -100,7 +100,6 @@ class management implements renderable, templatable {
             }
 
             $menu = new \action_menu();
-            $menu->set_alignment(\action_menu::BL, \action_menu::BL);
             $menu->set_menu_trigger(get_string('createnewcustomfield', 'core_customfield'));
 
             foreach ($fieldtypes as $type => $fieldname) {
diff --git a/grade/edit/tree/lib.php b/grade/edit/tree/lib.php
index 7317c8ea624..e4435bce6b9 100644
--- a/grade/edit/tree/lib.php
+++ b/grade/edit/tree/lib.php
@@ -129,7 +129,6 @@ class grade_edit_tree {
         $actionsmenu = new action_menu();
         $actionsmenu->set_menu_trigger(get_string('edit'));
         $actionsmenu->set_owner_selector('grade-item-' . $eid);
-        $actionsmenu->set_alignment(action_menu::TL, action_menu::BL);
 
         if (!$is_category_item && ($icon = $this->gtree->get_edit_icon($element, $this->gpr, true))) {
             $actionsmenu->add($icon);
@@ -1090,4 +1089,4 @@ class grade_edit_tree_column_select extends grade_edit_tree_column {
 
         return $togglegroup;
     }
-}
\ No newline at end of file
+}
diff --git a/h5p/classes/output/libraries.php b/h5p/classes/output/libraries.php
index a3aef637c50..87af31d6561 100644
--- a/h5p/classes/output/libraries.php
+++ b/h5p/classes/output/libraries.php
@@ -81,7 +81,6 @@ class libraries implements renderable, templatable {
                 // Get the action menu options.
                 $actionmenu = new action_menu();
                 $actionmenu->set_menu_trigger(get_string('actions', 'core_h5p'));
-                $actionmenu->set_alignment(action_menu::TL, action_menu::BL);
                 $actionmenu->prioritise = true;
                 $actionmenu->add_primary_action(new action_menu_link(
                     new moodle_url('/h5p/libraries.php', ['deletelibrary' => $version->id]),
diff --git a/lib/outputcomponents.php b/lib/outputcomponents.php
index 18e5e271e2f..5b5e82e701b 100644
--- a/lib/outputcomponents.php
+++ b/lib/outputcomponents.php
@@ -4232,6 +4232,12 @@ class action_menu implements renderable, templatable {
      */
     public $prioritise = false;
 
+    /**
+     * Dropdown menu alignment class.
+     * @var string
+     */
+    public $dropdownalignment = '';
+
     /**
      * Constructs the action menu with the given items.
      *
@@ -4258,7 +4264,7 @@ class action_menu implements renderable, templatable {
             'aria-labelledby' => 'action-menu-toggle-'.$this->instance,
             'role' => 'menu'
         );
-        $this->set_alignment(self::TR, self::BR);
+        $this->dropdownalignment = 'dropdown-menu-right';
         foreach ($actions as $action) {
             $this->add($action);
         }
@@ -4436,10 +4442,13 @@ class action_menu implements renderable, templatable {
     /**
      * Sets the alignment of the dialogue in relation to button used to toggle it.
      *
+     * @deprecated since Moodle 4.0
+     *
      * @param int $dialogue One of action_menu::TL, action_menu::TR, action_menu::BL, action_menu::BR.
      * @param int $button One of action_menu::TL, action_menu::TR, action_menu::BL, action_menu::BR.
      */
     public function set_alignment($dialogue, $button) {
+        debugging('The method action_menu::set_alignment() is deprecated, use action_menu::set_menu_left()', DEBUG_DEVELOPER);
         if (isset($this->attributessecondary['data-align'])) {
             // We've already got one set, lets remove the old class so as to avoid troubles.
             $class = $this->attributessecondary['class'];
@@ -4472,6 +4481,14 @@ class action_menu implements renderable, templatable {
         }
     }
 
+    /**
+     * Aligns the left corner of the dropdown.
+     *
+     */
+    public function set_menu_left() {
+        $this->dropdownalignment = 'dropdown-menu-left';
+    }
+
     /**
      * Sets a constraint for the dialogue.
      *
@@ -4633,6 +4650,7 @@ class action_menu implements renderable, templatable {
 
         $data->primary = $primary;
         $data->secondary = $secondary;
+        $data->dropdownalignment = $this->dropdownalignment;
 
         return $data;
     }
diff --git a/lib/outputrenderers.php b/lib/outputrenderers.php
index 774c048cc15..a4ff3c420b8 100644
--- a/lib/outputrenderers.php
+++ b/lib/outputrenderers.php
@@ -3469,7 +3469,6 @@ EOD;
             'nav-link'
         );
         $am->set_action_label(get_string('usermenu'));
-        $am->set_alignment(action_menu::TR, action_menu::BR);
         $am->set_nowrap_on_items();
         if ($withlinks) {
             $navitemcount = count($opts->navitems);
diff --git a/lib/templates/action_menu_trigger.mustache b/lib/templates/action_menu_trigger.mustache
index 6aa4476ac11..0c3b07f98e9 100644
--- a/lib/templates/action_menu_trigger.mustache
+++ b/lib/templates/action_menu_trigger.mustache
@@ -33,6 +33,7 @@
         ],
         "secondary": {
             "classes": "menu  align-tr-br",
+            "dropdownalignment": "dropdown-menu-right",
             "attributes": [
                 {"name": "id", "value": "action-menu-0-menu"},
                 {"name": "data-rel", "value": "menu-content"},
@@ -92,7 +93,7 @@
         {{/menutrigger}}
     </a>
     {{#secondary}}
-        <div class="dropdown-menu dropdown-menu-right {{classes}}"{{#attributes}} {{name}}="{{value}}"{{/attributes}}>
+        <div class="dropdown-menu {{classes}} {{dropdownalignment}}"{{#attributes}} {{name}}="{{value}}"{{/attributes}}>
             {{#items}}
                 {{#actionmenulink}}
                     {{< core/action_menu_link}}
diff --git a/lib/upgrade.txt b/lib/upgrade.txt
index b5fdd52d3cc..023f613ab13 100644
--- a/lib/upgrade.txt
+++ b/lib/upgrade.txt
@@ -2,6 +2,8 @@ This files describes API changes in core libraries and APIs,
 information provided here is intended especially for developers.
 
 === 4.0 ===
+* The method action_menu->set_alignment() has been deprecated, please use action_menu->set_menu_left if you need a dropdown
+  to align to the left of the dropdown button.
 * The $OUTPUT->should_display_main_logo() function has been deprecated and should no longer be used.
 * New method flexible_table::set_columnsattributes() has been introduced to add column attributes applied in every cell.
 * New method flexible_table::get_row_cells_html() has been introduced, extracted from flexible_table::get_row_html
diff --git a/mod/assign/gradingtable.php b/mod/assign/gradingtable.php
index 36c3833f39b..0ac3e7573a4 100644
--- a/mod/assign/gradingtable.php
+++ b/mod/assign/gradingtable.php
@@ -1419,7 +1419,6 @@ class assign_grading_table extends table_sql implements renderable {
 
         $menu = new action_menu();
         $menu->set_owner_selector('.gradingtable-actionmenu');
-        $menu->set_alignment(action_menu::TL, action_menu::BL);
         $menu->set_constraint('.gradingtable > .no-overflow');
         $menu->set_menu_trigger(get_string('edit'));
         foreach ($actions as $action) {
diff --git a/mod/feedback/classes/complete_form.php b/mod/feedback/classes/complete_form.php
index e01132d14b3..64e0356e639 100644
--- a/mod/feedback/classes/complete_form.php
+++ b/mod/feedback/classes/complete_form.php
@@ -450,7 +450,6 @@ class mod_feedback_complete_form extends moodleform {
         $menu = new action_menu();
         $menu->set_owner_selector('#' . $this->guess_element_id($item, $element));
         $menu->set_constraint('.feedback_form');
-        $menu->set_alignment(action_menu::TR, action_menu::BR);
         $menu->set_menu_trigger(get_string('edit'));
         $menu->prioritise = true;
 
diff --git a/mod/quiz/classes/output/edit_renderer.php b/mod/quiz/classes/output/edit_renderer.php
index e58956e4819..7076f527770 100644
--- a/mod/quiz/classes/output/edit_renderer.php
+++ b/mod/quiz/classes/output/edit_renderer.php
@@ -592,7 +592,6 @@ class edit_renderer extends \plugin_renderer_base {
             return '';
         }
         $menu = new \action_menu();
-        $menu->set_alignment(\action_menu::TR, \action_menu::TR);
         $menu->set_constraint('.mod-quiz-edit-content');
         $trigger = html_writer::tag('span', get_string('add', 'quiz'), array('class' => 'add-menu'));
         $menu->set_menu_trigger($trigger);
diff --git a/payment/accounts.php b/payment/accounts.php
index 012b2b9decb..d7fa2ec470c 100644
--- a/payment/accounts.php
+++ b/payment/accounts.php
@@ -57,7 +57,6 @@ foreach ($accounts as $account) {
     }
 
     $menu = new action_menu();
-    $menu->set_alignment(action_menu::TL, action_menu::BL);
     $menu->set_menu_trigger(get_string('edit'));
     if ($canmanage) {
         $menu->add(new action_menu_link_secondary($account->get_edit_url(), null, get_string('edit')));
diff --git a/question/classes/local/bank/edit_menu_column.php b/question/classes/local/bank/edit_menu_column.php
index 3810733c6cf..567209cf259 100644
--- a/question/classes/local/bank/edit_menu_column.php
+++ b/question/classes/local/bank/edit_menu_column.php
@@ -77,7 +77,6 @@ class edit_menu_column extends column_base {
 
         $menu = new \action_menu();
         $menu->set_menu_trigger(get_string('edit'));
-        $menu->set_alignment(\action_menu::TL, \action_menu::BL);
         foreach ($this->actions as $actioncolumn) {
             $action = $actioncolumn->get_action_menu_link($question);
             if ($action) {
diff --git a/theme/boost/scss/moodle/bootstrap-rtl.scss b/theme/boost/scss/moodle/bootstrap-rtl.scss
index 6c54f041ff6..da2a1e14525 100644
--- a/theme/boost/scss/moodle/bootstrap-rtl.scss
+++ b/theme/boost/scss/moodle/bootstrap-rtl.scss
@@ -17,14 +17,6 @@
     background-position: 0.75rem center;
 }
 
-/*rtl:raw:
-.dropdown-menu {
-    right: auto;
-    left: 0;
-    text-align: right;
-}
-*/
-
 .dir-rtl .custom-switch .custom-control-input:checked ~ .custom-control-label::after {
     transform: translateX(-($custom-switch-width - $custom-control-indicator-size));
 }
diff --git a/theme/boost/style/moodle.css b/theme/boost/style/moodle.css
index b33cb59e535..adde53571ce 100644
--- a/theme/boost/style/moodle.css
+++ b/theme/boost/style/moodle.css
@@ -9847,13 +9847,6 @@ a.text-dark:hover, a.text-dark:focus {
 .dir-rtl .custom-select {
   background-position: 0.75rem center; }
 
-/*rtl:raw:
-.dropdown-menu {
-    right: auto;
-    left: 0;
-    text-align: right;
-}
-*/
 .dir-rtl .custom-switch .custom-control-input:checked ~ .custom-control-label::after {
   transform: translateX(-0.9375rem); }
 
diff --git a/theme/classic/style/moodle.css b/theme/classic/style/moodle.css
index 5f782bb5af8..83eadb21b2b 100644
--- a/theme/classic/style/moodle.css
+++ b/theme/classic/style/moodle.css
@@ -9847,13 +9847,6 @@ a.text-dark:hover, a.text-dark:focus {
 .dir-rtl .custom-select {
   background-position: 0.75rem center; }
 
-/*rtl:raw:
-.dropdown-menu {
-    right: auto;
-    left: 0;
-    text-align: right;
-}
-*/
 .dir-rtl .custom-switch .custom-control-input:checked ~ .custom-control-label::after {
   transform: translateX(-0.75rem); }
 
diff --git a/user/profile/index.php b/user/profile/index.php
index c2806e64fbf..1bb1fad0bd8 100644
--- a/user/profile/index.php
+++ b/user/profile/index.php
@@ -135,7 +135,6 @@ foreach ($categories as $category) {
 
     // Add new field menu.
     $menu = new \action_menu();
-    $menu->set_alignment(\action_menu::BL, \action_menu::BL);
     $menu->set_menu_trigger($strcreatefield);
     foreach ($options as $type => $fieldname) {
         $action = new \action_menu_link_secondary(new \moodle_url('#'), null, $fieldname,