Hello @inverse, issues with games run with Proton are being tracked in the Proton issue tracker. This specific issue is being tracked at https://github.com/ValveSoftware/Proton/issues/4904.
Closing as a duplicate.
ahh wasnt aware of that place thanks!
Your system information
Please describe your issue in as much detail as possible:
I'm running Cinnamon at 150% scaling on my UHD monitor and games scale incorrectly under this setting.
If i change my display to 100% it works fine but I was wondering how I could change games to launch at 100% scale under this environment without scaling back my DE when wanting to play.
The steam client scales perfectly.
Steps for reproducing this issue: