Open the Themes app
Tap Me
Tap Customize
Tap Icons
Select an icon pack or theme
Tap Apply
If needed, download a theme that includes custom icons
To change individual app icons, long-press the app icon on the home screen
Tap Edit
Choose a new icon if available
Tap OK or Save
If your Huawei model does not support custom icons, use a third-party launcher from the AppGallery or trusted source