Two monitors 1920x1080 as 3840x1080 on Ubuntu 20.04.1

The graphic card that I used is RTX A4000. Driver version: 510.73.05. I need to merge two 1920*1080 monitors as 3840 x 1080 (like ultra-wide). I couldn’t see any settings in nvdia x server. Also I tried compizconfig but it didn’t work out. How to maximise a window across two monitors? - Ask Ubuntu

This would usually be achieved by using randr 1.5 monitor objects but AFAIK, Gnome still doesn’t support this.

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