Force Close Apps
There are a couple of ways to force close apps. If you’re not familiar with force closing, this is simply a way to close out an app that isn’t functioning correctly or that is taking up valuable memory. Apple’s memory management has always been rather good, so we don’t recommend force closing apps if you’re not experiencing issues.
You can close apps using the previously mentioned gesture or swiping up with three fingers and holding to access the app switcher. From here use your finger or cursor to swipe up on the app you wish to close. To use your cursor, hover over the app and swipe up on the trackpad with two fingers.
You can also use the keyboard to force close apps, but it can only be done from the Home screen. When switching between apps using cmd +tab, continue to hold cmd on a selected app and press “q” to close it.