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If you have checked the “Show Displays” ON menu bar in “Display Preferences” then you can
configure the displays by clicking the display icon in the menu bar.
This menu allows you to perform the following actions:
Detect all displays connected to the Mac
Turn display mirroring on/off
Set the resolution of both the primary display, and the additional display(s)
Open “Display Preferences”
CONFIGURING DISPLAYS FROM THE MENU BAR (macOS)