Desktop switching display glitch

Hi pierre452,

Welcome to the Apple Support Communities. We understand that your display isn't working as expected, so we'd like to see how we can help. Start by checking your cable or adapter. Disconnect the cable from your external display from your Mac, then reconnect it. Also, make sure your Mac and display are connected with good quality cables and adapters. If you have any nearby electrical devices, try relocating them or moving your Mac and display to see if you notice an improvement.

To further isolate the behavior, create another administrator account with these steps: Set up users, guests, and groups on Mac. This step will help with determining if the issue only occurs with a specific account.

Take care.

pierre452,

You're most welcome. The best step forward would be to reach out to Apple Support directly. They can be contacted here: Get Support, or by calling the most applicable phone number from this list: Contact Apple for support and service.

All the best.

I get this too, on my m1 MacBook Air. It occurs in the top right of the screen. I don't have any external cables or desktops connected. Hope this bug can be fixed soon.