The Oppo smartphone has the normal sound mode or the silent mode. Unlike Android, there is no vibration mode under ColorOS. To turn on the vibration during silent mode, we have to set this in the settings.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  Sound & vibration
Step 3:  Enable or Disable  Vibrate on silent
  1. Open the Settings
  2. Tap on Sound & vibration
  3. Enable or Disable Vibrate on silent

Oppo Instructions
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