Oppo
Turn Banner Notifications On or Off Per App auf Oppo
Banner notifications appear briefly at the top of the screen for standard alerts and stay visible for the full ringing duration on incoming calls. Coloros controls this behavior per app, not through one global switch, so one app can keep adding entries to your notification shade while its banners stay muted, and another app can behave the opposite way.
To adjust a single app, open Settings ➔ App management ➔ App list ➔ Choose an App ➔ Manage notifications and switch Banner on or off. If the app groups notifications into categories such as messages, promotions or calls, the same screen lets you flip banners for each category separately instead of muting the entire app.
Turning off banners does not disable notifications completely. The app still adds entries to the notification shade and lock screen, only the temporary pop-up at the top disappears. If you want an app fully silent, including sound and the shade, disable its notifications entirely instead of just the banner option.
Your per-app banner choices survive system updates. They reset only if you clear the app data or reinstall the app.