Testing scenario The feature added are not used by core plugins yet. To test it you need to use the alpha version of mod_subsection: Install the mod_subsection. From your Moodle root folder run:  git clone -b main https://github.com/aanabit/mod_subsection mod/subsection   Login as admin and install the plugin Create a course with a couple of activities. 'Add a new activity or resource' at the end of an existing section in the course page. Confirm the 'Subsection' resource is shown in the Activity Chooser Mark 'Subsection' resource as favourite. Confirm 'Subsection' resource is shown in the Starred tab of the Activity Chooser. Add a new activity or resource between 2 activities of a section using the + button. Confirm the 'Subsection' resource is shown in the Activity Chooser Confirm 'Subsection' resource is shown in the Starred tab of the Activity Chooser. Create a Subsection activity. Click in the created Subsection activity. 'Add a new activity or resource' at the end of the subsection page. Confirm there is no 'Subsection' resource in the Activity Chooser Confirm there is no Starred tab. Add a new activity or resource between 2 activities of a section using the + button. Confirm there is no 'Subsection' resource in the Activity Chooser Confirm there is no Starred tab.