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Close Excess Notifications

Sometimes a lot of excess notifications might appear on your Mac (often effectively the same one hundreds of times). Closing them one at a time can take a long time; sometimes they seem to go on forever. A restart usually fixes this, but you can also fix it with one simple terminal command...

Run the "Terminal" app (it is in the "Utilities" folder, in the "Applications" folder).
Type: "killall NotificationCenter" (without the quotes).
The notifications should disappear.
Quit from Terminal.

The process starts itself again quickly, so real notifications should start appearing.