StarTech.com USB2DVI - Manual (Page 9)

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Here, you can set the secondary display to
act as an extension of the primary desktop,
or as a mirror image that duplicates the
contents on the primary display.
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.
Media Playback
Please note that while operating in Extended Mode, USB2DVI can
display media files and DVDs using a broad variety of media players,
however in Clone Mode, limited support is available for video playback.
Mac OS X
To configure the display settings and monitor positions, bring up the
Displays Preferences from the System Preferences menu:
The Display settings for each display will appear on the individual
monitors themselves. To configure them all from a single location,
press the “Gather Windows” button and each screen’s Displays
Preferences windows will appear on that display.
All supported video resolutions will appear in the list on the left side.
To change the positioning of each display, click on the “Arrangement“
button (found only on the primary display) and you can then virtually
reposition each display.