@ciku-karugi you still have ‘lock camera to view’ ticked on when you go out of camera view, so it keeps adjusting its view..
I would recommend deleting this camera and adding a new one to start fresh. Tick on ‘lock camera to view’ and go into camera view mode. Pan around until your happy with the angle. Then don’t forget to tick off ‘lock camera to view’ before going out of camera view! Then it will remember your settings.
Hope this helps