i-tec USB 3.0 Manual De Instrucciones página 16

EN USB 3.0/USB-C/Thunderbolt 3 Dual Docking Station HDMI DVI + VGA
Click on Arrangement and in the default mode (Extended desktop) click on the
new monitor and drag it as necessary vis-à-vis the Mac monitor. If you select
Mirror displays the mode will change to Mirror (the resolution of the monitors
will be automatically adjusted according to their parameters and the highest
possible resolution will be set on both monitors). By cancelling the Mirror
displays option you will return to the Extended desktop mode.
Extended mode: The arrow indicates the possible position of the connected
monitor vis-à-vis the Mac monitor.
Extended mode: In this mode you can choose the Main monitor
16 by dragging the Menu Bar.