If an app is acting up, here's how to force-quit it iPhone X and newer: Swipe up halfway and pause to reveal the App Switcher view. Then, swipe up on the app to close. iPhone SE, 8, and earlier: ...
Almost everyone using a PC clicks the X button to close apps. It's accessible and conspicuously marked and naturally has become second nature. However, after using the X button, the app you closed may ...