Screen Flickering Issues

Desktop - KDE

Hello everyone,
I need help with a problem that I can't get fixed.
I recently made a display setting by mistake which resulted in me only having the image in the video.

Unfortunately, I can't see what I'm typing in the terminal to try some fixes.

The monitor is connected via DP. When I connect the PC to the TV via HDMI, the problem does not occur. Is there anything I can try even though I can't actually see the terminal?
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