How to force quit the "Force Quit Applications" window 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.
You can close it with ⌘ cmd+w.

There's a list of the official keyboard shortcuts on apple.com