The StellarMate Control Panel (on port 3000) gave me some options for switching screen resolution, I tried one and decided I didn't like it, but now I don't see that option on control panel anymore, and the standard Raspberry Pi OS screen-res switcher doesn't have options to go as high as I used to have it. This is 1.5.4. Any suggestions?
That will only work for some standard resolutions and not all, the only real way is to edit the config.txt file, if raspi.config has worked for you, then you have been very lucky....
After trying resolution change i ended up with a low 1024x720 with no way to change back.
The above solution i mentioned got me back with 1920x1080 what i used to have.