How to set multiple for Apple camera?

The camera of Apple's mobile phone is very strong, so you need to zoom in when you need a long viewing angle. So how does Apple's camera set the zoom? I'll tell you below for reference only.

How to set the multiple of 1 for Apple Camera? First, open the camera icon on the phone desktop.

2. After turning on the camera, put two mobile phones in the middle of the screen and slide diagonally in any direction of the screen.

3. Finally, drag the cursor below to set the magnification of the camera.