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On occasion, when attempting to either go into fullscreen or maximize a window, I will accidentally trigger the split screen setup, where half of the desktop turns blue. However, if the application doesn't support split screen, it gets stuck this way. The top taskbar is gone, so there are no menus. Cmd + Tab doesn't do anything. Trying to drag any window into the blue area or the other side doesn't do anything, except maybe move the blue area from one side to the other. The only fix I've found so far is to completely shut the machine off, as I can't log out (I just Googled and found a way to do so via CLI, but that's not intuitive for most).

Is there a way to either cancel split screen or successfully enter into split screen so that I can then exit?

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Pressing Esc has worked for me. In High Sierra, the option is blocked in the first place, and in the case of no other windows supporting split screen you can click in the blurry area with no available windows.

  • Esc does not appear to work for me. I'm also on Sierra, so perhaps I just need to bump to Mojave. – ND Geek Dec 19 '18 at 19:39
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However, if the application doesn't support split screen, it gets stuck this way.

Try Force Quit apps, Hold Option+Command+ESC

  • I suspect this is the correct answer, but I haven't been able to reproduce the issue to verify. I am starting to think it may also be related to my multi-monitor setup. – ND Geek Dec 23 '18 at 19:59
  • all I said is to force quit the app that is causing problems with your split screen. i do not know which app that was. – Ruskes Dec 23 '18 at 20:10
  • Right. I was experimenting with various apps over the last few days trying to recreate the issue, but with no luck. I suspect finding the appropriate app and killing it may do the trick, but I cannot verify without first reproducing the issue. – ND Geek Dec 24 '18 at 0:49

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