I can use Ctrl ⌃ and the left/right arrows to switch individual desktops on a multiscreen system but can you switch all of them at once?
1 Answer
Only by disabling "Displays have separate Spaces"
System Prefs > Mission Control
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tbh, It drove me mad for one whole day when it was first introduced, in, I think, Mavericks. It's been off ever since.– TetsujinMay 2, 2015 at 20:19