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External Monitor black screen if not in Mirror Mode

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I have a Dell XPS 9750 from 2016 and installed Ubuntu 22.04 LTS on it. I have an external Monitor directly connected to the Laptop (Dell U2518). The external monitor is recognized in settings with correct naming and resolution. But the screen is black (no signal) in the default "Join Displays" mode. When i switch to the "Mirror" mode the external and Laptop Monitor work as expected and show an image. If i try to select "Single Display" mode with the external monitor selected both screens go black. I already tried setting the external monitor as primary monitor, but this leaves me with a black screen again. I have done multiple re-boots, installed the latest NVidia Drivers (525.89), Intel UHD 630 Graphics are Ubuntu Certified and i tried playing with prime-select nvidia|intel.

I suspect it to be due to my laptop resolution being 3840x2160 and my external monitors resolution being 2560x1440, but i would like to use both screens with max. resolution. On windows this works OOTB so i must be missing some config here.

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