On the Oppo smartphone home screen, a notification point can be displayed on the app icon to indicate a new unread notification.

Under ColorOS 6 and ColorOS 7 Oppo does not display the number of notifications. Under this version it is only possible to display a point badge. The notification point must also be activated or deactivated for each individual app. Unfortunately there is no central setting on Oppo.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  App management
Step 3:  Tap on  App list
Step 4:  Choose desired  App
Step 5:  Tap on  Manage notifications
Step 6:  Choose between  Dot  and  No badge
  1. Open the Settings
  2. Tap on App management
  3. Tap on App list
  4. Choose desired App
  5. Tap on Manage notifications
  6. Choose between Dot and No badge

Oppo Instructions