I'm using win10.
I have 2 Radeor RX 580 series monitors 3840 x 2160.

There's one program I would use several times/day IF I could only read the text in it. But it's old, and was designed for a smaller screen and on my monitors the text is super-tiny. Too small to be worth trying to work with.

I was hoping I could do screen splitting with DisplayFusion, then set the resolution in ONE of the split screens to be different than in all other split-screens, so that I could just put that program in it's own screen, set to a size I can read. But I can't figure out how to do that & it doesn't seem built to do that.

I can't just set one monitor's resolution to work with the old program, because I need to access a lot of other programs on that same monitor, and they all get too unwieldy. And changing the resolution in display settings every time I want to use that program is too cumbersome - I'd need it for 5 minutes every few hours - it's a pain.

So - now I'm trying to figure out if I could use DisplayFusion to set a custom monitor display size to trigger just when I open or focus on that one program, then put it back to normal when I close the program or focus elsewhere.

Is that possible? Or - does anyone have any other ideas about how to solve my problem?

Ok - thanks. I fiddled with the compability settings again & just couldn't make it work out.

What I ended up doing was to use my surface tablet as a 3rd monitor, set the resolution to much lower and just dedicate that to my problem program when I'm at my desk. That sort of solves the problem.