Acer Aspire X3995 User Manual page 17

Setting up displays
Right-click on the desktop and choose Screen resolution.
•
Choose the monitor that you want to set as the primary monitor
•
and check Make this my main display, then press Apply and OK
to change the setting.
If you want to extend your desktop to the second monitor, select
•
the secondary monitor, then set it to Extend or Clone, and apply
your change.
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