I called up Spotlight to search for a folder As I hovered over the folder name in the list, the window appeared to the left showing the Folder.
I clicked on the folder in the spotlight list and it opened. Spotlight disappeaed. However, the Spotlight window showing the folder will not close. The Activity Monitor doesn't show anything.
I Force Quit the Finder, thinking it had control. Nothing.
I don't know how to get rid of the window short of rebooting of the computer.
You don't have to reboot. Just log out and log back in.
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