By default, notifications are displayed on the Oppo smartphone lock screen, and even the content of a notification is displayed with it. If the content of the notification is not desired, Oppo offers a function in ColorOS to turn off the content. The notification is still displayed on the lock screen, but the content is hidden.

Android 10 (ColorOS 7.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Privacy
Step 3:  Tap on  Lock screen
Step 4:  Choose between  Show all notification content,   Hide sensitive content  and  Hide all notifications
  1. Open the Settings
  2. Tap on Privacy
  3. Tap on Lock screen
  4. Choose between Show all notification content, Hide sensitive content and Hide all notifications

Oppo Instructions
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