To quit (close) a Mac app normally, choose Quit from the app's menu in the menu bar, or press Command (⌘)-Q. If the app doesn't quit, follow these steps to force the app to quit.
Mar 26, 2019 Open Clipboard on Mac when using Microsoft Word or Excel If you are using Microsoft Office apps such as Word or Excel, you can still open Clipboard on your Mac via the Finder app to review the contents. Microsoft also adds a layer of extra options when you are trying to paste the content from Clipboard into another app such as Word. See full list on wikihow.com.
How to force an app to quit
Press these three keys together: Option, Command, and Esc (Escape). Or choose Force Quit from the Apple menu in the upper-left corner of your screen. (This is similar to pressing Control-Alt-Delete on a PC.)
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Then select the app in the Force Quit window and click Force Quit.
You can even force the Finder to quit, if it stops responding: Select Finder in the Force Quit window, then click Relaunch.
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How to force an app to close on your iPhone, iPad, or iPod touch.