From my experience at least, some games are just like this, more often than not when using proton. I don’t really have this issue that often after switching to i3wm. Can you switch to a different workspace? Is your game in fullscreen? It usually works better for me in windowed borderless. The benefit of using i3 is that you can run games in standard windowed mode, and let i3 fullscreen the application, or just switch workspace entirely. Hopefully this helps.
From my experience at least, some games are just like this, more often than not when using proton. I don’t really have this issue that often after switching to i3wm. Can you switch to a different workspace? Is your game in fullscreen? It usually works better for me in windowed borderless. The benefit of using i3 is that you can run games in standard windowed mode, and let i3 fullscreen the application, or just switch workspace entirely. Hopefully this helps.