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.
How to force an app to quit
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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.)
All Mac OS versions run on a technology called Gatekeeper, It’s designed to ensure that only trusted software runs on your Mac. If the software you are trying to open is not certified you will see a message like this “can’t be opened because apple cannot check it for malicious software.”.
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.
Learn more
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- Using an app that can’t be checked for malicious software might harm your Mac or compromise your privacy. If you’re certain that the app you want to use is from a trustworthy source, you can override your Mac security settings to open it. See the Apple Support article Safely open apps on your Mac.
- All Mac OS versions run on a technology called Gatekeeper, It’s designed to ensure that only trusted software runs on your Mac.If the software you are trying to open is not certified you will see a message like this “can’t be opened because apple cannot check it for malicious software.”.
Photoshop 2020 Won't Open Mac
How to force an app to close on your iPhone, iPad, or iPod touch.