diff --git a/course/format/classes/output/local/content/cm/groupmode.php b/course/format/classes/output/local/content/cm/groupmode.php
index ad96fd9395f..21434749ae6 100644
--- a/course/format/classes/output/local/content/cm/groupmode.php
+++ b/course/format/classes/output/local/content/cm/groupmode.php
@@ -74,7 +74,8 @@ class groupmode implements named_templatable, renderable {
         if (!$this->format->show_groupmode($this->mod)) {
             return null;
         }
-        if ($this->format->show_editor() && $this->format->supports_components()) {
+        $usecomponents = $this->format->supports_components();
+        if ($this->format->show_editor() && $usecomponents && !$this->mod->coursegroupmodeforce) {
             return $this->build_editor_data($output);
         }
         // If the group mode is not editable, the no groups badge is not displayed.
diff --git a/course/format/tests/behat/activity_groupmode.feature b/course/format/tests/behat/activity_groupmode.feature
index b8b2b31909b..24f36b22abc 100644
--- a/course/format/tests/behat/activity_groupmode.feature
+++ b/course/format/tests/behat/activity_groupmode.feature
@@ -89,3 +89,24 @@ Feature: Verify activity group mode interface.
     And I open "Activity sample" actions menu
     And I choose "Group mode > Separate groups" in the open action menu
     And "Separate groups" "icon" should exist in the "Activity sample" "core_courseformat > Activity groupmode"
+
+  @javascript
+  Scenario: Teacher cannot see Group mode submenu for an activity when group mode has been forced
+    Given the following "course" exists:
+      | fullname       | Course 2 |
+      | shortname      | C2       |
+      | category       | 0        |
+      | numsections    | 3        |
+      | groupmode      | 1        |
+      | groupmodeforce | 1        |
+    And the following "course enrolments" exist:
+      | user     | course | role           |
+      | teacher1 | C2     | editingteacher |
+    And the following "activities" exist:
+      | activity | name            | intro                  | course | idnumber | section |
+      | forum    | Activity sample | Test forum description | C2     | sample   | 1       |
+    And I am on the "C2" "Course" page logged in as "teacher1"
+    And I turn editing mode on
+    When I open "Activity sample" actions menu
+    Then "Group mode" "link" should not exist in the "Activity sample" "activity"
+    And "Separate groups" "button" should not exist in the "Activity sample" "core_courseformat > Activity groupmode"
diff --git a/course/lib.php b/course/lib.php
index 67c56595351..e6b8d4efd03 100644
--- a/course/lib.php
+++ b/course/lib.php
@@ -1810,7 +1810,7 @@ function course_get_cm_edit_actions(cm_info $mod, $indent = -1, $sr = null) {
     }
 
     // Groupmode.
-    if ($courseformat->show_groupmode($mod) && $usecomponents) {
+    if ($courseformat->show_groupmode($mod) && $usecomponents  && !$mod->coursegroupmodeforce) {
         $groupmodeclass = $courseformat->get_output_classname('content\\cm\\groupmode');
         /** @var core_courseformat\output\local\content\cm\groupmode */
         $groupmode = new $groupmodeclass($courseformat, $sectioninfo, $mod);