I'm using Ubuntu 19.10, XFCE desktop environment. My computer has a dedicated NVIDIA graphic card inserted and a 23-inch AOC monitor that allows to set native resolution to 1920x1080.
While installing OS, I also create my own account. At the first time logged into, I create another (administrator) account for my wife who is sometimes going to use this computer.
Everything works fine, except of a strange problem: only in my own account I can get 1920x1080 display. Once I log out, the login screen will become 1024x768. When I log into my wife account, I get 1024x768 too, and there is no way to increase resolution, and no way to access NVIDIA X Server Settings app.
FYI, there are 3 different OSes in my computer. This problem does not happen with Fedora 31 and Windows 10.
What is the root cause? How to fix that?