I have encountered an issue where running a Unity game created with version 2022.1.15f1 on the Steam Deck via Proton causes it to run in a square aspect ratio instead of filling the whole screen. It remains like this even when forcing the resolution to something else.
This only happens with exclusive fullscreen, so as a work around I have just disabled exlusive mode when running on the Deck, but it’s still a very strange issue. It even happens in a fresh project.
I have a project on a much older version of Unity (2018), which does not exhibit this problem.
Has anyone else encountered this? This must be an issue with Unity. The only other example I’ve seen of someone having the same problem is on this Reddit post
