

It’s supposed to scale correctly, but otherwise Gamescope will take care of that particular issue.
Kinda annoying on Xorg when the game just decides my screen should be 800x600 and then proceeds to crash and leave me at 800x600 on a 4K display with scaling set to 200%.
Wine has always done that, last seen on Plasma 5 (I switched to Wayland with Plasma 6), and I remember that being a thing way back in 2007 too. Valved patched the scaling in Proton as well I believe so that might be why it didn’t do that.
It behaves how fullscreen apps work on Windows, takes over your whole display and messes with the resolution and all.