If the rotation lock is not on, that shouldn't matter. The rotation lock will keep it in profile mode and turn it sideways if you try to go to landscape. If it is not locked, it should just transition between the views.
This happens to me with my new Samsung galaxy s9 ultra tablet. Nothing helps, including changing the settings on the tablet. And I can't get anyone on zoom to help me! In using latest software, reinstalled etc. It only started happening a few weeks ago. Before that it was fine. HELP!!!!