Oppo does not offer a general setting to enable or disable the keyboard sound under its ColorOS user interface. Most Oppo smartphones use the Gboard keyboard, which allows the keyboard sound to be turned on or off. By default, the sound is turned off.

Android 10 (ColorOS 7.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Additional settings
Step 3:  Tap on  Keyboard & input method
Step 4:  Tap on  Gboard
Step 5:  Tap on  Preferences
Step 6:  Enable or Disable  Sound on keypress
  1. Open the Settings
  2. Tap on Additional settings
  3. Tap on Keyboard & input method
  4. Tap on Gboard
  5. Tap on Preferences
  6. Enable or Disable Sound on keypress

Oppo Instructions
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