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I just replaced a BenQ monitor by an LG Ultrawide one as a secondary device to my 2017 Macbook Pro. When using AirPlay to my Apple TV (AirPlaying the Macbook screen), I used to be able to keep using my secondary monitor as if nothing was happening.

However, since I changed my secondary screen, turning on AirPlay automatically turns on this secondary screen into mirroring mode (with a terrible stretch due to the aspect ratio differences).

Any idea how to fix that?

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I solved the problem by clicking on Use as Separate Display and going back to Mirroring Retina Display. Sometimes the windows get a little messed up, but it's much better now!

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