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Since I updated my Mac (I'm using a Mac Mini M1, macOS Big Sur 11.2.3), it has a strange behavior now.

I have 2 screens. There is a mirror-like effect but not completely mirrored on both. I have the same amount of Desktops on both screens. If I had a new Desktop on one, it will had a new Desktop on the other as well.

When I switch to an other Desktop, say I go to the 3rd desktop in one screen, it will switch to the 3rd desktop on the other screen as well.

And last weird behavior: when I switch to full mode on youtube on one screen, the other screen switch to a full mode but with a black screen.

However, I'm saying it's not completely mirrored because the 2 sceens are still different. I can have different activities on both screen besides the behaviors mentioned.

Am I the only one who got this ?

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This is a Mission Control pref.
System prefs > Mission Control > check "Displays have separate Spaces"

enter image description here

Personally, I don't consider it "weird" at all. This is my default working method, but I never use fullscreen, so I never get the blank screen.

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  • Thanks ! It's works fine now. :D
    – popo63301
    Mar 26, 2021 at 18:33

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