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If your Mac is actually freezing, or not responding, see Mac Keeps Freezing? How to Close the App. If you have an app that is not responding, you can try to force quit the app by either of the following: Go to Apple menu Force Quit. Press 3 keys at the same time: ESC, Option and Command. Select your app, then select Force Quit. Using Mac OS X Dock One of the simplest and easiest ways to force-quit an app that’s non-responsive is to just use the ‘Option’ key: Use the ‘control’ button and the mouse or trackpad to click on.
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.
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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.)
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.