How to set the navigation key of oppo mobile phone?

The operation setting method is as follows:

1. Open your phone and click Settings.

2. Enter the main setting interface of OPPO R 15.

3. After entering the main interface of settings, find Smart Convenience and click Smart Convenience.

4. Enter the intelligent and convenient main interface.

5. After entering the intelligent and convenient main interface, click the navigation key.

6. Enter the navigation key main interface.

7. After entering the navigation key main interface, click the virtual key to navigate.

8. Enter the virtual button navigation main interface and select what you need.