i-tec USB-C Travel Adapter PD/Data Guide D'instructions Et Mode D'emploi page 7

possible resolution will be set on both monitors). By cancelling the Mirror displays option you will return to
the Expanded desktop mode.
Expanded desktop mode: The arrow indicates the possible position of the connected monitor vis-à-vis the
Mac monitor.
In the Expanded desktop mode you can choose the Main monitor by dragging the Menu Bar.
Mirror mode: This mode can only be used if supported by the Mac.