How to set the negative screen of Huawei mobile phone?

The steps are as follows:

First, the first step is to unlock the screen of the mobile phone and then enter the main interface of the mobile phone.

Second, long press the blank space of the main interface of the mobile phone to bring up the desktop drag bar.

Third, click the "Settings" button in the lower right corner of the desktop manual bar to open more settings.

4. After opening more settings, scroll down to find the "negative one screen" option and look at the switches at the back.

5. At this time, return to the desktop and slide to the right, and you will see that the "negative screen" has been successfully opened.