Unlike Android, iOS lacks a feature that allows you to close all open background apps. As a result, on the iPhone 13 or any other iPhone, closing all apps at once is impossible. With gesture-based navigation, though, you may close as many as three apps at once. Swipe up from the bottom and hold your finger on the display for roughly a second to end several apps on iPhone 13 or 13 Pro Max. All open apps will now be shown in the App Switcher. Place three fingers on three different app cards at the same time, then swipe up to close all three apps.