diff --git a/.upgradenotes/MDL-87929-2026021310531011.yml b/.upgradenotes/MDL-87929-2026021310531011.yml
new file mode 100644
index 00000000000..e7c4c7735e6
--- /dev/null
+++ b/.upgradenotes/MDL-87929-2026021310531011.yml
@@ -0,0 +1,9 @@
+issueNumber: MDL-87929
+notes:
+  theme:
+    - message: >-
+        The `core_courseformat\base` class now includes
+        `set_show_restrictions_expanded()` and `get_show_restrictions_expanded()`
+        to allow course formats to define whether restrictions are displayed
+        as expanded (defaulting to collapsed).
+      type: improved
diff --git a/public/availability/tests/behat/display_availability.feature b/public/availability/tests/behat/display_availability.feature
index 5655baaa054..38a7ba90de7 100644
--- a/public/availability/tests/behat/display_availability.feature
+++ b/public/availability/tests/behat/display_availability.feature
@@ -196,10 +196,15 @@ Feature: Display availability for activities and sections
     And I am on the "C1" "Course" page logged in as "teacher1"
     And I turn editing mode on
     And I add the "Navigation" block if not present
-    # Add a restriction to section 1 (visible to students).
+    # Add a couple of restrictions to section 1 (visible to students).
     And I edit the section "1"
     And I set the following fields to these values:
       | Access restrictions | Grouping: GX1 |
+    And I expand all fieldsets
+    And I press "Add restriction..."
+    And I click on "Date" "button" in the "Add restriction..." "dialogue"
+    And I set the field "direction" to "until"
+    And I set the field "x[year]" to "2020"
     And I press "Save changes"
     # Change to student view.
     And I am on the "Course 1" "Course" page logged in as "student1"
@@ -207,7 +212,9 @@ Feature: Display availability for activities and sections
     When I click on "Section 1" "link" in the "Navigation" "block"
     # Section 1 should be visible and show info.
     And I should see "Section 1" in the "page-header" "region"
-    And I should see "Not available unless" in the "region-main" "region"
+    And I should see "It is before end of" in the "region-main" "region"
+    And I should not see "Show more" in the "region-main" "region"
+    And I should not see "Show less" in the "region-main" "region"
     And "Page 1" "link" should not exist in the "region-main" "region"
     # Check the logs.
     And I am on the "C1" "Course" page logged in as "teacher1"
@@ -234,9 +241,14 @@ Feature: Display availability for activities and sections
       | name | course | idnumber |
       | GX1  | C1     | GXI1     |
     And I am on the "Glossary 1" "glossary activity editing" page logged in as "teacher1"
-    # Add a restriction to Glossary 1 (visible to students).
+    # Add a couple of restrictions to Glossary 1 (visible to students).
     And I set the following fields to these values:
       | Access restrictions | Grouping: GX1 |
+    And I expand all fieldsets
+    And I press "Add restriction..."
+    And I click on "Date" "button" in the "Add restriction..." "dialogue"
+    And I set the field "direction" to "until"
+    And I set the field "x[year]" to "2020"
     And I press "Save and return to course"
     And I turn editing mode on
     And I add the "Navigation" block if not present
@@ -247,7 +259,9 @@ Feature: Display availability for activities and sections
     When I click on "Glossary 1" "link" in the "Navigation" "block"
     # Glossary 1 should be visible and show info.
     Then I should see "Glossary 1" in the "page-header" "region"
-    And I should see "Not available unless" in the "region-main" "region"
+    And I should see "It is before end of" in the "region-main" "region"
+    And I should not see "Show more" in the "region-main" "region"
+    And I should not see "Show less" in the "region-main" "region"
     And "Add a new entry" "link" should not exist
     # Check the logs.
     And I am on the "C1" "Course" page logged in as "teacher1"
diff --git a/public/course/classes/route/controller/restricted_section.php b/public/course/classes/route/controller/restricted_section.php
index 82db465ae28..2082792fdf8 100644
--- a/public/course/classes/route/controller/restricted_section.php
+++ b/public/course/classes/route/controller/restricted_section.php
@@ -63,6 +63,8 @@ class restricted_section {
         $context = \context_course::instance($course->id);
         $format = course_get_format($course->id);
         $format->set_sectionid($section->id);
+        // We always want to show the restrictions expanded in the restricted section page.
+        $format->set_show_restrictions_expanded(true);
         $outputclass = $format->get_output_classname('content');
         $sectionoutput = new $outputclass($format);
         $PAGE->set_url('/course/section.php', ['id' => $section->id]);
diff --git a/public/course/format/classes/base.php b/public/course/format/classes/base.php
index b01d07be1a8..8d491217e06 100644
--- a/public/course/format/classes/base.php
+++ b/public/course/format/classes/base.php
@@ -81,6 +81,8 @@ abstract class base {
     protected $singlesection = null;
     /** @var int|null the sectionid when a single section is selected, null when multiple sections are displayed. */
     protected $singlesectionid = null;
+    /** @var bool Whether restrictions should be expanded. */
+    protected $showrestrictionsexpanded = false;
     /** @var course_modinfo the current course modinfo, please use course_format::get_modinfo() */
     private $modinfo = null;
     /** @var array cached instances */
@@ -664,6 +666,24 @@ abstract class base {
         return $this->singlesectionid;
     }
 
+    /**
+     * Set whether restrictions should be expanded.
+     *
+     * @param bool $expanded True if restrictions should be expanded, false otherwise.
+     */
+    public function set_show_restrictions_expanded(bool $expanded): void {
+        $this->showrestrictionsexpanded = $expanded;
+    }
+
+    /**
+     * Get whether restrictions should be expanded.
+     *
+     * @return bool True if restrictions should be expanded, false otherwise.
+     */
+    public function get_show_restrictions_expanded(): bool {
+        return $this->showrestrictionsexpanded;
+    }
+
     /**
      * Set the current section number to display.
      * Some formats has the hability to swith from one section to multiple sections per page.
diff --git a/public/course/format/classes/output/local/content/section/availability.php b/public/course/format/classes/output/local/content/section/availability.php
index 47a4f4df71f..bbac32cdf30 100644
--- a/public/course/format/classes/output/local/content/section/availability.php
+++ b/public/course/format/classes/output/local/content/section/availability.php
@@ -197,6 +197,10 @@ class availability implements named_templatable, renderable {
             }
         }
 
+        if ($this->format->get_show_restrictions_expanded()) {
+            $data->showrestrictionsexpanded = true;
+        }
+
         return $data;
     }
 
diff --git a/public/course/format/templates/local/content/availability.mustache b/public/course/format/templates/local/content/availability.mustache
index 681769f9ff3..2174e89b5dc 100644
--- a/public/course/format/templates/local/content/availability.mustache
+++ b/public/course/format/templates/local/content/availability.mustache
@@ -34,13 +34,16 @@
 {{/excerpt}}
 {{#excerpt}}
     {{< core/showmore }}
+        {{$defaultstatus}}
+            {{^showrestrictionsexpanded}} collapsed {{/showrestrictionsexpanded}}
+        {{/defaultstatus}}
         {{$collapsedcontent}}
             {{#pix}}t/unlock, core{{/pix}} <span class="availability-excerpt"> {{{excerpt}}} ... </span>
         {{/collapsedcontent}}
         {{$expandedcontent}}
             {{#pix}}t/unlock, core{{/pix}} {{{text}}}
         {{/expandedcontent}}
-        {{$buttonextraclasses}}fw-bold{{/buttonextraclasses}}
+        {{$buttonextraclasses}}fw-bold {{#showrestrictionsexpanded}} d-none {{/showrestrictionsexpanded}}{{/buttonextraclasses}}
         {{$collapsedextraclasses}}text-truncate pe-2 {{#editing}}mt-2{{/editing}}{{/collapsedextraclasses}}
         {{$expandedextraclasses}}
             {{^editing}}py-2{{/editing}}
diff --git a/public/course/format/templates/local/content/cm/restricted.mustache b/public/course/format/templates/local/content/cm/restricted.mustache
index 59f8044a7bb..42ba68a1e4f 100644
--- a/public/course/format/templates/local/content/cm/restricted.mustache
+++ b/public/course/format/templates/local/content/cm/restricted.mustache
@@ -61,7 +61,10 @@
     {{! Availability }}
     {{#modavailability}}
         {{$ core_courseformat/local/content/cm/availability }}
-            {{> core_courseformat/local/content/cm/availability }}
+            {{< core_courseformat/local/content/cm/availability }}
+                {{$buttonextraclasses}} d-none {{/buttonextraclasses}}
+                {{$defaultstatus}} expanded {{/defaultstatus}}
+            {{/core_courseformat/local/content/cm/availability }}
         {{/ core_courseformat/local/content/cm/availability }}
     {{/modavailability}}
 </div>
diff --git a/public/lib/templates/showmore.mustache b/public/lib/templates/showmore.mustache
index ecd339c1b36..e95a51c600a 100644
--- a/public/lib/templates/showmore.mustache
+++ b/public/lib/templates/showmore.mustache
@@ -28,7 +28,7 @@
         "expandedextraclasses": "bg-secondary"
     }
 }}
-<div class="showmore-container collapsed {{$extraclasses}}{{extraclasses}}{{/extraclasses}}" data-region="showmore">
+<div class="showmore-container {{$defaultstatus}} collapsed {{/defaultstatus}} {{$extraclasses}}{{extraclasses}}{{/extraclasses}}" data-region="showmore">
     <button
         type="button"
         class="showmore-button btn btn-sm btn-link p-0 {{$buttonextraclasses}}{{buttonextraclasses}}{{/buttonextraclasses}}"