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Use AirPlay to stream what’s on your Mac to an HDTV
AirPlay Mirroring lets you send what’s on your Mac to an HDTV wirelessly with Apple TV.
Make sure your Mac and Apple TV are on the same network.
Click the Screen Mirroring icon
in the Control Center, then choose your Apple TV. To set whether your desktop matches the size of the Mac screen or the TV screen, click the AirPlay status icon
then choose This Mac or your Apple TV. When you’re using AirPlay Mirroring, the AirPlay status icon in the menu bar is blue.