How can I hide the navigation bar, Back, Home and Recent keys?

There are two ways to hide the navigation bar:

Way 1:

Touch “Settings” -> “Display” -> “Navigation bar” -> “Buttons” -> “Button layout”. Choose the pattern in “Hide navigation bar” -> When the app opens, the navigation bar will be automatically hidden and you can swipe up from the bottom corner of the screen to show it.

Way 2:

Touch “Settings” -> “Display” -> “Navigation bar” -> “Full screen gestures”. The navigation bar will be hidden and you will be shown “Gesture demos” to explain how to operate the “Go back”, “Go to Home screen” and “Open Recents” functions.