2. After entering the setting interface, find the "System and Update" option in the interface and click Enter.
3. After entering, find the "System Navigation Mode" option in the interface and click Enter.
4. Finally, select "Three-key Navigation on Screen" in the interface.
5. After selection, three navigation icons will appear at the bottom of the screen, namely the recent button, the home button and the back button. Of course, these three icons can also be interchanged.