I was wondering how to change the resolution of my emulator, I tried a few times with different settings and error messages that says "check if your computer supports resolution" (paraphrased) comes up each time.

I want to be able to play some snes games with a full screen not just a small window in the middle of my monitor

I have a just below high grade pc (I think at least)

I forget how to the diagx or what ever they use for windows 10, for my system specs or I would send it along with this maybe in the future