Overscan refers to a cropped image on your TV screen. Here are some examples:
A setting on your TV zooms in on movie content, so that you can't see the outermost edges of the film.
Your TV's plastic border blocks some of the TV screen, so that you can't see the edges of the content.
Underscan
Nov 02, 2019 How to watch Apple TV+ shows or movies in the TV app. Open Apple TV on your Mac. Two-finger swipe or scroll on the Apple TV+ section under What to Watch. Click on the show you want to watch. Click Play or Play Episode. Mar 24, 2020 Add the Apple TV Remote to Control Center, then open Control Center. Tap, then choose your Apple TV. If asked, enter the four-digit code on your iOS device that appears on your Apple TV. The Apple TV Remote in Control Center works with Apple TV 4K, Apple TV HD, and Apple TV (3rd generation).
Underscan is usually intended, and refers to black bars that appear around a movie or show. The bars appear because the content was filmed in a different proportion than your TV screen. Here are some examples:
Black bars appear above and below a movie because it has a wider aspect ratio than your TV screen.
Black bars appear left and right of a TV show, because it has a smaller aspect ratio than your TV screen.
Adjust the screen size
When viewing content from your Mac or iOS device on your TV or projector, you can adjust the screen size to fit your TV or projector. You can look for these settings on your Mac, your Apple TV, or in the menu of your TV or projector.
Adjust from the menu on your Mac
While mirroring your Mac to a TV or projector, go to System Preferences > Displays. From here, you can use the slider to adjust the overscan or underscan setting.
If you see an option to change the screen resolution, you can choose the one that matches the dimensions of your TV or projector. If necessary, check your TV or projector's manual to find the display resolution.
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Adjust from the menu on your Apple TV
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While using AirPlay to watch content from your Mac or iOS device on your TV or projector, you can adjust the size of the picture in the Settings menu of your Apple TV.
On Apple TV 4K or Apple TV HD, go to Settings > AirPlay > AirPlay Display Underscan.
On Apple TV (2nd or 3rd Generation), go to Settings > Audio & Video > Adjust for AirPlay Overscan.
Adjust from the menu on your TV or projector
Some TVs and projectors let you adjust overscan or underscan from a settings menu or button on your remote. Look for a Zoom button or check your TV or projector for a menu called Aspect Ratio, presentation mode, computer mode, or a similar setting.
For more help, check the manual that came with your TV or projector or contact the manufacturer.
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Control your Apple TV with your iOS device
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Before you begin, check the following:
Make sure that your Apple TV is connected to your television, powered on, and connected to your home Wi-Fi network.
If your Apple TV is turned off, you can turn it on without a remote. Just unplug your Apple TV from power, then plug it back in.
If you have a new Apple TV that hasn’t been set up, plug your Apple TV in to your Wi-Fi router with an ethernet cable.
Then follow the steps below to set up the Apple TV Remote in Control Center.
Use the Apple TV Remote in Control Center
If you’ve set up your iOS device to control your Apple TV, then the Apple TV Remote is automatically added to Control Center when you update to iOS 12 or later.
If you haven’t set up your iOS device to control your Apple TV or have an earlier version of iOS, follow these steps:
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Make sure that your iOS device is on the same Wi-Fi network as your Apple TV.
Add the Apple TV Remote to Control Center, then open Control Center.
Tap , then choose your Apple TV.
If asked, enter the four-digit code on your iOS device that appears on your Apple TV.
The Apple TV Remote in Control Center works with Apple TV 4K, Apple TV HD, and Apple TV (3rd generation).
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Buy a new remote
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You can also buy a new Siri Remote or Apple TV Remote for your Apple TV from the Apple Online Store, Apple Store, or other retailer.
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If you have the remote for a different Apple TV, you might be able to use that remote to control your current Apple TV. Get help with the remote for your Apple TV.
If the remote for your Apple TV 4K or Apple TV HD isn’t working, try charging the remote.
Depending on your television, you might not be able to control the volume with Apple TV Remote in Control Center.