Ubuntu – Turn off built-in display ubuntu 18.04 LTS

18.04display

I have ubuntu 18.04 LTS installed with gnome 3.28.1. In settings I can't find a switcher which turns built-in display off. I proceeded settings->devices->displays. And there is no buttons as were on 17.10. How can I turn the display off either via bash or GUI?
See a screenshot

Best Answer

Use the Single display tab instead of Join displays tab.

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