Case 1 (Moodle version <=3.8): Go to course Turn editing on Reduce the browser to mobile Click 'Add an activity and resource' Scale screen size to full screen or click 'Maximize' button on browser Scale screen again to mobile view or click 'Restore down' button of browser Verify that there is no more a grey background appear and the pop-up is fullscreen Case 2 (Moodle version <=3.8): Go to the course Turn editing on Reduce the browser to mobile view Click 'Add an activity and resource' Scale screen size to full screen or click 'Maximize' button on browser Scale screen again to mobile view or click 'Restore down' button of browser Click 'Escape' button to close the pop-up Click 'Add an activity or resource' again Verify that there is no more a blank space below 'Add' button Case 3 (Moodle version >=3.9): Go to /question/edit.php?courseid=<your course id> (you can also get there through the UI) Resize browser to mobile size. Click 'Create a new question...' Scale screen size to full screen or click 'Maximize' button on browser Scale screen again to mobile view or click 'Restore down' button of browser Verify that there is no more a grey background appear and the pop-up is fullscreen