Oppo
Change Lock Screen Wallpaper auf Oppo
ColorOS stores home screen and lock screen wallpapers as two separate slots, but the picker opens with one shared gallery for both.
If you only choose an image and confirm without picking a target, most Oppo phones apply the wallpaper to both screens at once. That is why a new lock screen picture can silently overwrite your home screen too, or the other way round.
Open Settings ➔ Personalizations ➔ Wallpapers. Tap Photos to browse your own gallery, or pick one of the standard wallpapers instead.
After you select a photo, tap Apply. On the next screen, choose Lock screen from the option list rather than the combined option. This applies the picture only to the lock screen and leaves your home screen untouched.
Live wallpapers follow the same steps. Motion effects on the lock screen can use a bit more battery than a static image, especially with the screen waking often. If the phone feels slower after switching, going back to a static wallpaper is usually the faster fix.