Change Displays Arrangement preferences on Mac
If you connected one or more displays to your Mac, you can arrange them in any configuration in the Arrangement pane of Displays System Preferences.
To open this pane, choose Apple menu > System Preferences, click Displays, then click Arrangement.
Display graphic representation
Drag any of the displays to a different position. You can also drag the menu bar to any display.
Simultaneously show the same image on your Mac and all connected displays.
Show mirroring options in the menu bar when available
Show devices available for AirPlay Mirroring in the menu bar.
Moves all open Displays preferences windows to the display where this button is. This button appears only if more than one display is connected to your Mac.