If I go fullscreen in any mediaplayer (such as YouTube, Crunchyroll, Prime Video or Jellyfin) I get a bar at the top and a bar in the left. You can see either the wallpaper or another programm, its like shifted to the right and bottom. I know its a problem with tunred off Hardwareacceleration. If I turn it back on the problem never occurs. I tried with troubleshoot mode enabled but there I couldnt recreate it because the problem does not occur, even after I turn troubleshoot mode off. The problem only occurs again after a complete restart of the computer.

I know there are other posts with the same problem but there was never a solution.