My Huawei icons are all black and white?

The application icon is black, and the desktop only displays black and white. When the application icon is opened, it displays 'Screen Time Management',

Cause of the problem:

Screen Time Management switch is turned on. , after the restriction time expires, the application icon will turn black.

Solution:

Search for "Healthy Mobile Phone Use" in settings and turn off the screen time management switch after entering.