StarTech.com USB2DVIPRO - Manual (Page 10)

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Here, you can set the secondary display to
act as an extension of the primary desktop
(Extend), or as a mirror image that duplicates
the contents on the primary display (Mirror) or
set the display on the adapter as the primary
display (Set as Main Monitor). If using a laptop,
once the adapter is set as the primary display,
the screen on the laptop can be disabled
(Notebook Monitor Off).
Similarly, the screen resolution, color quality,
position of the screen and rotation of the screen can be adjusted from
this menu.
To disable the secondary display, select Off.
Normal Rotated Left
Rotated Right Upside-Down
“Screen Rotation”
Examples
“Extend To”
Examples