How does Huawei mobile phone take pictures when the home screen is closed?

Using the off-screen snapshot function, the specific opening and using methods are as follows (taking Huawei p20pro mobile phone as an example):

1. Open Huawei p20 mobile phone, find the camera APP in the desktop main interface or folder, and click Open.

2. Click the "Settings" button in the upper right corner of the app interface that appears later.

3. Pull the setting item to the bottom, and click the setting item of "Off-screen Snapshot" to enter.

4. Then click the "Start the camera to take pictures" function.

5. After this function is turned on, aim the lens at the object to be photographed in the screen lock state, and then quickly double-click the volume down button to finish shooting when the main screen is closed.