I have my laptop and Two monitors. I just want to use my two monitors as two separate displays, and don't care about my laptop. Under Settings -> Displays, when I select Join Display, I would have my laptop as display1 and two monitors as display2, so I can not use two monitors as two separate displays. Any Suggestion?
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You can try with Settings -> Devices -> Displays Change Display Mode - Single Display and select the monitor you want

DPK
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I wan to use two monitors as two separate displays, so this doesn't work! – user2698013 Mar 26 '21 at 05:22
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No one in Ubuntu community doesn't solve this problem! – user2698013 Mar 26 '21 at 17:43
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Once the second screen is attached use the following shortcut keys Super-key (or Windows-Key) + P. Each time its pressed you will cycle between
- Extended display
- Duplicate display
- display attached screen/projector only
- native (laptop/desktop) screen only
Stolen from How to have duplicate display on ubuntu 14.04 with gnome

Addison
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