diff --git a/source/blender/editors/include/UI_tree_view.hh b/source/blender/editors/include/UI_tree_view.hh
index 19d4b961df9..2d66d0feb79 100644
--- a/source/blender/editors/include/UI_tree_view.hh
+++ b/source/blender/editors/include/UI_tree_view.hh
@@ -228,6 +228,7 @@ class AbstractTreeViewItem : public AbstractViewItem, public TreeViewItemContain
 
   /**
    * Return whether the item can be collapsed. Used to disable collapsing for items with children.
+   * The default implementation returns true.
    */
   virtual bool supports_collapsing() const;
 
diff --git a/source/blender/editors/interface/interface_template_grease_pencil_layer_tree.cc b/source/blender/editors/interface/interface_template_grease_pencil_layer_tree.cc
index e6f07f8e468..cc09a97b15b 100644
--- a/source/blender/editors/interface/interface_template_grease_pencil_layer_tree.cc
+++ b/source/blender/editors/interface/interface_template_grease_pencil_layer_tree.cc
@@ -251,11 +251,6 @@ class LayerGroupViewItem : public AbstractTreeViewItem {
     build_layer_group_buttons(*sub);
   }
 
-  bool supports_collapsing() const override
-  {
-    return true;
-  }
-
   bool supports_renaming() const override
   {
     return true;