How does Xiaomi 3 mobile phone switch from camera mode to camera mode?

Hello, the interface after entering the camera is like this.

Click the icon in the middle of the top row to switch between photography and photography:

Click to display the following interface.

Then click the red dot in the middle of the bottom of the screen to start recording. After opening the video, there will be time to display it in the upper right of the screen. The following figure