OPPO mobile phone navigation keys (navigation gestures) refer to navigation gestures used when using operations such as "return to the previous level, return to the desktop, view recent tasks, switch recent tasks". ColorOS12 and above: The navigation keys provide two navigation methods: full-screen gestures and virtual keys. You can go to "Settings > System Settings > System Navigation Method" on your phone to set the navigation method you need. ColorOS 11.0-11.1 version: The navigation key provides three navigation methods: sliding gestures on both sides, virtual buttons, and slide-up gestures. You can go to your phone's "Settings > Convenient Tools > Navigation Methods > (More)" to set the navigation method you need. 1. Sliding gestures on both sides (full-screen gestures): (1) Return to the previous level: Swipe inward from the lower left or right side of the screen. (2) Return to the desktop: Swipe up from the bottom of the screen. (3) View recent tasks: Swipe up from the bottom of the screen and hold. (4) Switch to recent applications: Swipe left or right from the bottom of the screen. 2. Virtual keys: (1) After turning on the function, virtual keys will be displayed at the bottom of the phone screen. ≡: View recent tasks□: Return to the desktop_: Return to the previous level Due to different mobile phone system versions, the operation path may be slightly different. Please refer to the actual operation interface display of the mobile phone. This answer applies to all OPPO models.