When a laptop is plugged into a classroom’s system, whether it’s a ceiling projector or television screen, the image can be transmitted in one of two display modes: display mirroring or extended desktop. Laptops will generally default to mirroring, but that cannot be guaranteed, so it’s important to know the difference between the two modes and how to toggle them.
- Display mirroring (or Duplicate): What appears on the laptop screen is reproduced exactly on the projected image or television screen. This is the mode most users prefer to be in.
- Extended desktop: The projected image or television screen becomes an extension of the laptop screen, usually to the right-hand side. Users can access the area by moving the cursor off the laptop screen. By default, only the desktop wallpaper - no icons - can be seen on the projected image or television screen.
To toggle between display mirroring and extended desktop:
- Select the Command key (⌘) and F1 key at the same time.
Mac with Touch Bar:
- Select the Apple icon (apple shape) in the upper left corner of the screen, and then select System Preferences.
- Select the icon labeled Displays (computer shape).
- Inside the Arrangement tab, check or uncheck the Mirror Displays check box to toggle between the two display modes.
- Select the Windows key (shaped like a window with four panes) and the P key at the same time. A display switcher screen will pop up on the right-hand side.
- Select the desired display mode from Duplicate or Extend.
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