The Huawei P20 Pro can be decorated with an individual wallpaper. So if the default theme is too boring for you, you can replace the wallpaper on the Huawei P20 Pro homesceen with your own photo as follows:
Wallpaper change - Instructions
Start from the home screen and open the settings.
Then navigate further up:
- Display --> Background --> Set Background
Now proceed by tapping on "Gallery" and then selecting a corresponding photo from your gallery as background image.
Confirm the new background image by tapping on the check mark in the upper right corner.
You now know how to change the background image on the Huawei P20 Pro.