We can completely disable notifications of an installed app on the OnePlus smartphone if no message notifications are desired.

This option only affects the selected app and its sound and vibration settings for notifications.

Android 10 | OxygenOS 10.0
Notifications for individual apps -  Open the  Settings
Notifications for individual apps -  Tap on  Apps & notifications
Notifications for individual apps -  Tap on  See all apps
Notifications for individual apps -  Choose an  app
Notifications for individual apps -  Tap on  Notifications
Notifications for individual apps -  Enable or disable  Show notifications
  1. Open the Settings
  2. Tap on Apps & notifications
  3. Tap on See all apps
  4. Choose an app
  5. Tap on Notifications
  6. Enable or disable Show notifications

OnePlus Instructions
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