Desktop Mirroring or Extend

When connected to an external display, Mac and Windows computers have two different display modes: Mirror and Extend. In Mirror Mode the computer monitor duplicates the monitor on the external display so that you see the same picture on both the desktop and projector. In Extend Mode the external display is treated as a separate screen so that you can have a different windows open on the projector and desktop. It is easy to switch between the two settings.

MAC – Change External Display Mode

To turn on (or off) Desktop Mirror click the small icon of a monitor on the upper right side of the menu bar and select Turn On Mirroring

Changing the Desktop Mirroring Setting
Changing the Desktop Mirroring Setting

Windows – Change External Display Mode

Windows uses the term Duplicate instead of Mirroring. Follow the instructions below to change the external display settings.

Windows 10

  1. Right click on an empty area of the desktop
  2. Choose Display Settings



  3. Scroll Down to the Multiple displays area and select select Duplicate these displays or Extend these displays


Windows 7

  1. Right click on an empty area of the desktop
  2. Choose Screen Resolution



  3. Click the Multiple displays drop-down list, and then select Duplicate these displays or Extend these displays