HiDPI and uidescription?

Yes, they are the same size. Neither one is using my 2x graphics. I added a bright yellow mark to my 2x background so that I can easily tell it from the original. (If I use my menu item to call setZoomFactor() myself, then it does show the 2x graphics with that yellow mark.)

If the screenshot sizes are the same, then the apps don’t run in HiDPI mode. I don’t know why you don’t get them to run in that mode, but that’s the issue you have to solve.

Ok, it’s working now. I had to set a system setting via the command line (DisplayResolutionEnabled) in order to see the HiDPI selection on my Mac desktop computer, which allowed me to select a HiDPI mode on my monitor. Now I am getting the 2x images I am supposed to see.

(Unfortunately, my non-Apple hi-resolution monitor still doesn’t have a HiDPI selection available for this testing for some reason, but I can use my regular monitor to see that the correct images are being used, and that’s enough for my development and testing purposes.)

Thanks for the help, Arne!