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Mirror Display to Projector or Secondary Monitor

By default, plugging in an external display or connecting your Mac to a projector will "extend" your desktop with additional space rather than mirroring what you see on the built-in screen. To show your laptop screen over a projector or mirror the screen to a secondary display you must enable "Display Mirroring" by following these steps:

  1. Make sure your additional display is properly connected and powered on.
  2. From the Apple () menu, choose System Preferences.
  3. From the View menu, choose Displays.
  4. Click the Arrangement tab.
  5. Enable (check) "Mirror Displays" in the bottom-left corner.

More information on options available when connecting your Mac to external displays is found here:

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