If we touch menu items in the system or the navigation keys on the OnePlus smartphone, we receive a short tone or acoustic feedback that informs us of the selected input.

If desired, the touch tones or sounds can be (de)activated at any time to further adapt the navigation on the device to the user's needs.

Android 10 | OxygenOS 10.0
Touch sounds -  Open the  Settings
Touch sounds -  Tap on  Sounds & vibration
Touch sounds -  Tap on  System sounds
Touch sounds -  Enable or disable  Touch sounds
  1. Open the Settings
  2. Tap on Sounds & vibration
  3. Tap on System sounds
  4. Enable or disable Touch sounds

OnePlus Instructions