TalkBack changes the control of the Oppo-Smartphone. A single tap marks the selected item. A double tap executes the desired function.

TalkBack's settings offer many more control options, including fingerprint sensor control, touch gestures, key combinations and much more.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  Additional settings
Step 3:  Tap on  Accessibility
Step 4:  Tap on  TalkBack
Step 5:  Open the  Settings
Step 6:  Adjust the  Navigation settings
  1. Open the Settings
  2. Tap on Additional settings
  3. Tap on Accessibility
  4. Tap on TalkBack
  5. Open the Settings
  6. Adjust the Navigation settings

Oppo Instructions