Elecable USB to HDMI/DP 4K, User Manual

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USING BOTH EXTENDED AND MIRRORED DISPLAYS
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 you wish to mirror over the primary display. Repeat this with each
display you wish to mirror, those untouched will remain extending.
CHANGING THE MAIN DISPLAY
You can change which is the main display by moving the Menu Bar between
displays. Changing the main display affects where new windows appear and
the position of the Dock. The ‘Menu Bar’ can be moved so that it is shown on
an alternative display. Clicking the white menu bar and dragging it to the
desired display will perform this action.