While fully closing apps on your iPhone can keep it running at peak efficiency since it frees up memory and stops background refreshing, it's best used as a way to deal with unresponsive apps. When you have an issue with a certain app, just force-close it instead of rebooting. But the process of force-closing on the new iPhone X is different than other models, so how do you do it?
Since iOS 7, force-closing apps on most iPhones has remained the same and has carried over into iOS 11. So you will still double-click the home button and swipe up on the unresponsive app to close it. Since the iPhone X is the only iPhone without a home button, you'll need to do something different.
Force-closing apps on the iPhone X is still very intuitive, though, and with a little bit of practice, can be mastered faster than you can say "Qi." To access the app switcher, you'll need swipe up from the bottom of the screen, then stop in the middle of the screen until all of the app cards appear. If you swipe too fast and don't hold, you'll just go back to your home screen.
The multitasking screen works similarly on the iPhone X as it does on other iPhone models, where you can swipe right or left to browse currently used apps that are either in a suspended state or currently using background app refresh. You can even swipe up on one of these cards to force-close it just like on any other iPhone.
But that's not the only way you can close an app completely in the iPhone X's app switcher. You also have the older long-press gesture employed in iOS 4 through iOS 6, where you'd tap and hold onto a target app until a red button marked with a minus ( - ) sign appeared that you can then tap on to close.
As this extra feature isn't enabled on other iPhones and iPads, it's worth noting that it may not be set in stone, and could be omitted when the iPhone X becomes available to the public. That said, we'll be sure to post an update as more concrete details surface, so stay tuned.