If you are using a district-issued MacBook Air running the latest macOS 15 (Sequoia) AND an Apple TV, you may have noticed that your Mac screen no longer fills the entire TV screen when screen mirroring—leaving annoying black bars on both sides of the TV. This behavior is known as "letterboxing."
An easy fix is available.
After you have shared your Mac screen to your TV using an Apple TV, re-select Screen Mirroring.
Click Change.
Select Entire Screen, then click Start Mirroring.
In my tests, performing these steps causes the Mac to fill the entire TV screen on subsequent Apple TV connections. (However, you may need to re-do the steps if you connect to a different screen.)
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