Linux Mastering Development

desktop & display issues on Kubuntu 20.04

Today, issues appeared on my desktop computer with Kubuntu 20.04. I tried to shutdown via buttons in the menu, but it did not work, causing an error message to appear, where I clicked on "report bug", including subsequent freezing of the desktop environment. Via terminal, I shutdown the computer and rebooted afterwards. Now, the display is fixed at a very low resolution, with no settings change possible.
I checked the active video card, which is my dedicated nvidia rtx card. My secondary display is not recognized at all. When booting Kubuntu live from usb device, everything is fine. Does anybody have an idea what happened? How can I reset my OS / reset all video related settings and drivers to a state before this happened?

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