Not specific to steamdeck but I have a 21:9 ultra wide and find I need to change the desktop res to a 16:9 in advance of connecting via steam link for things to work
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Same
If you were under Linux, you could have the start command change desktop resolution with xrandr. But since you are on Windows it looks like qres is a command line app to help you achieve the same thing: https://m.majorgeeks.com/files/details/qres.html
There's also HDR switch: https://github.com/bradgearon/hdr-switch
Using the nvstreamer1080 option may be a bit easier, but nice to have options!
Edit: I should read better. Did you try
C:\\path\\to\\QRes.exe /x:1200 /y:800
Just run from you command line first until you get the hang of it
I use nvstreamer1080 to change the res when I use sunshine. I also have a dummy HDMI that goes up to 4k60 hooked to it
Interesting. I'll have to give this one a try as nothing I've tried seems to support custom resolutions.