

You have already done most of what I would do, but here is my list:
- Try another Proton version (in my experience Proton 6 seems stable and sufficiently different)
- Check ProtonDB if this problem is known
- Read the logs in the command line output
- Try both steam-native and steam-runtime (maybe this is only an Arch thing?)
- First back up, then delete the entire protonprefix (
~/.local/share/Steam/steamapps/compatdata/<GAME-ID>
). THIS WILL ALSO REMOVE ALL SAVEFILES OF THE GAME! - Use an Xorg desktop environment instead of Wayland
Clearly we need self-centering support from editors.