The "Force Quit Applications" window opened spontaneously due to memory pressure.
Now I can't close the "Force Quit Applications" window itself . The "X" button doesn't close the window and it doesn't have an icon in the dock or a menu bar.
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Sign up to join this community⌘ cmdW was not working for me either.
I had luck by opening the "normal" Force Quit window from Apple menu > Force Quit…, which replaced the out-of-memory Force Quit window. I was then able to close it normally with the X button.
cmd + w didn't work at first step.
Than I force closed all "paused" applications one by one, after that cmd + w worked.
⌘CMD
+W
work?