j5 create JUA190 - USB 2.0 VGA Display Adapter - Manual (Page 41)

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Mirror Mode
When Mirror selected, the screen
of display device, which is
connected to USB Display
Adapter, will be the same as the
main display, and Display Rotation
will be disabled automatically.
You can select either “Horizontal
Flip”, or “Vertical Flip”.
Primary Mode
When Primary is selected, the
display device, which is
connected to USB Display
Adapter, will become the main
display, the display of the internal
graphics card will automatically
switch to be the extended display
and act as an extension desktop.