>>542406798
>>542412774
You'll also want to set the screen resolution (etc.) via launch options, unless you're okay with running the game at 800x600 or whatever the default resolution is.
The only obvious way to change the video settings is to run a separate executable for the setup launcher, and running it with Proton is possible but it's a pain in the ass and not worth it. (Even on Windows, where in theory you can just double-click this setup launcher, it sucks because it doesn't remember settings until a registry key is created manually, and even then, the settings are saved only for the setup launcher and aren't applied when running the game directly, so you'd have to launch the game through the setup window every time in order to use non-default settings.)
This horrible setup launcher works by running the game with command-line arguments, so it can be bypassed just by adding the arguments to the Steam launch options.
The launch options used when my screenshot was taken are
>PROTON_DXVK_D3D8=1 MANGOHUD=1 %command% -adapter=0 -tq=32 -tf=2 -aa=4 -lg=2 -lt=2 -pd=2 -s=1 -w=1600 -h=1200 -d=32
where -w and -h are the resolution width and height.
Since Windows users have an existing (albiet horribly shitty) solution already, and also don't understand the concept of command-line arguments and probably don't know how to see what arguments were passed to a running program, this is documented almost nowhere except for this game's thread on the Proton issue tracker:
>https://github.com/ValveSoftware/Proton/issues/2255
The only other place I've seen it documented is a comment on this Steam guide (which I can't read, but I can see the command-line arguments are the same as mine except for resolution):
>https://steamcommunity.com/sharedfiles/filedetails/?id=689308999
Someone who isn't lazy should put this information on PC Gaming Wiki (where the various issues with the settings launcher are mentioned but the command-line options are not).