The mobile phone plays its own video, how to fix it? I have turned off the screen of my mobile phone.

The reason for this situation is that the vertical screen lock function of the mobile phone is set incorrectly. The method is as follows:

Preparation materials: Xiaomi 9 mobile phone

1. Slide left and right on the mobile phone screen to find the setting icon of Xiaomi 9 mobile phone.

2. Click to open the settings page of Xiaomi 9 mobile phone, and click the "Display" menu item in the page.

3. Next, find the setting item of "Automatically rotate the screen" in the page displayed by Xiaomi mobile phone.

4. Click the switch behind the setting item to set it to off.

Shortcut toolbar settings

5. You can also drop down the screen on the opened Xiaomi 9 mobile phone screen.

6. Then look at the shortcut toolbar to see if there is an icon to rotate the screen. If there is no icon, please drop down the shortcut toolbar.

7. Find the "Direction Lock" icon in the expanded shortcut toolbar menu.

8. After clicking this icon, you can turn off the screen rotation function.