text and panel block view

If you are in full screen mode (watching a movie), you can go into the audio settings to set the audio/video sync.
If I do this, there is text and the panel blocking 3/4 of the screen so you cant see the video to actually set the a/v sync.

Am I doing something wrong or is this a bug?
thanks

(I am on android X9S box, and using the latest beta 17 RC and latest beta Titan..)