Game mode on Legion Go does not use the whole screen

There is a black bezel around my screen in game mode, it is running at the wrong resolution. This does not happen in Windows or desktop mode. I'm using Bazzite for handhelds (so with KDE).

I have only seen one report on the forum about this where the problem solved itself through a reinstallation. https://universal-blue.discourse.group/t/legion-go-steam-game-mode-at-the-wrong-resolution/899
Solution
Woohoo I got it! I followed these steps to change the UI scale for the internal display from "somewhere in the middle" to "max". https://github.com/ublue-os/bazzite/issues/1037#issuecomment-2091963653

I am not sure why the internal display was not already on max? Besides playing around with Waydroid once, this was a pretty boring Bazzite installation (not even Decky before today).
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