Lower than native resolution scaling issue

Hi I am using the latest Nobara 39 with KDE Plasma desktop.
Be default it uses Wayland.

My issue is that in certain games (Supreme Commander) I wish to use a lowered resolution due to the games not being developed with higher screen resolution in mind. Specifically I want to use a 16:10 res like 1920x1200 on my 1440P screen.

However when it does this, the lower res screen fills from the left rather than centered and the mouse pointer still behaves as if I was using it at native 256x1440 resolution, meaning if screen options are in the center (As is the case with the pause menu) I need to have my mouse somewhere in the middle of the screen, rather than where the menu stuff visually is.

Any help is wonderful.

Try this for your launch settings:

PROTON_NO_ESYNC=1 PROTON_NO_FSYNC=1 %command% /fullscreen 1920 1200

I got this from

Do check the rest of the entries over there

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It has the same problem with these commands also, thanks for the help.

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