Huawei P40, EMUI 12.0, set v3.1131524.

1, click display and brightness.

Open the phone settings and click Display and Brightness, as shown in the figure below:

2. Click More Display Settings.

After the display and brightness interface, click More Display Settings, as shown in the following figure:

3. Click the interactive screen saver.

After displaying the setting interface more, click the interactive screen saver, as shown in the following figure:

4. Click the image source.

After entering the screen saver settings, click the image source, as shown in the following figure:

5, set the screen saver picture

You can set Huawei mobile phone screensaver pictures as needed, as shown in the following figure: