Ableconn BC81440, Manual, Page: 30 / 42

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Setting the Display to Mirror / Extend mode
When in Mirror mode, additional displays will display what is being
shown on the primary display. Checking the “Mirror Display” on the
“Arrangement” pane enables this feature.
To extend connected displays, make sure that the “Mirror Display” on
the “Arrangement” pane is unchecked.
To work with both extended and mirrored displays, turn off mirroring
then in the Arrangement pane press and hold “cmd” and “alt” and drag
and drop the display uour wish to mirror over the primary display.