1. First, turn off the direction lock. Different mobile phone models will be different. As long as the screen can be turned into a rotatable mode, so will Huawei. Take Apple's mobile phone as an example.

2. Then, open the big learning page of teenagers' learning (the third issue of the ninth season will be demonstrated here) and open the split screen.

3. Click normally to start, and tilt the phone (if you don't understand, think about how to put the phone when watching the drama, and straighten the phone normally. )

4. At this point, the top button should appear, and click the progress bar.