What is the setting of Huawei P9 mobile phone? If the background color is black, how to change it back to white?

1, first find the "theme" icon on the desktop and click Open.

2. After entering the theme app, click the "My" icon in the lower right corner of the app.

3. On the personal page, click the "My Theme" item at the bottom of the personal information bar.

4. At this point, select any white theme on the theme page, and don't select the theme with black background.

5. After setting a new theme, open the settings of the mobile phone again and change it back to white.