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I play a lot of old games in PlayOnLinux and they support smaller resolutions like 1024x768 and 2048x1024
I also always use the virtual desktop because of the mouse support
So when I launch an old game and my Linux Desktop is 1680x1050, they appear windowed because the desktop doesn't switch to the game resolution.

Is there a way to run a command like\

xrandr 1024x768

When I launch a game in PlayOnLinux so the Linux Desktop will match the in-game resolution?

Configure button > (select  shortcut) > Miscellaneous tab > Command to exec before running the program

Perfect, what is a good command for Mint to resize the desktop resolution?
Will xrandr work?

Is there a way to run Terminal commands from the PlayOnLinux shortcut, so when I Run the game the xrandr -s command runs automatically?

Isn't that the same as what you asked before?

Oh, I didn't realize the "command to exec" before running the program applied to the shortcuts on the desktop.
I'll try it again.

Thanks

this works perfectly!  Thanks for the tip Petch

Also, do you think running:

taskset -c 0

would work as well?

would I have to add:

taskset -c 0 steam.exe

Or whatever the game executable is?