To turn the application on/off, follow these steps:
To
open an application:
Method One: On the main screen, click the application icon you want to open.
Method Two: Open the application from the list of most recently used applications, click the "Recent" button, and select the most recently used application window.
To close the application:
Click the "recent" key and drag left or right recently using the application window to close.
To close all running applications, click "Close all".
Note:
1. It is not possible to turn off music in this way when playing music.
2. When you click "Close all", you can lock the running application to prevent it from shutting down, and in the list of recently used applications, click on the "small lock" icon to lock the application.
All right, here's the whole procedure for this smartphone app to open and quit with the application, I'm sure you know how to operate it.