I had two things crash since adjusting the resolution.
NoMachine the remote control software crashed a few minutes after changing the resolution on the server computer. I reconnected and the image was automatically resized to use the former resolution. Nice touch by NoMachine.
I changed the resolution in the MuMu player to match the 1280×720 and the game looks worse. It shows that it has lower pixels in the display panel which makes sense. You would physically have less pixels at a lower resolution so that reasonable. It crashed the MuMu player.
So I will run this for a while and see what works. Perhaps there is something between the 1280-1900 resolution that will make both MuMu, my projector and NoMachine happy. If not, then perhaps I need to ditch NoMachine and buy something instead.
When you troubleshoot something, sometimes things are worse until you find the right combination of things. I have time and I don’t mind finding the right combination.