Nut switching SMS application

1. First open the main interface of the mobile phone, as shown in the figure below.

2. Then choose to double-click the "home button" of the mobile phone, as shown in the figure below. ?

3. After double-clicking the home button, you can open the background running program, as shown in the figure below.

4. Finally, click "Apply" on this page to switch to the previously opened program, and click "Brush" below to clean up the background program, as shown below.