By default, TalkBack pronounces passwords, so anyone in the vicinity can listen in on the password. If desired, the pronunciation of passwords can be deactivated on the Oppo Smartphone.

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:  Enable or Disable  Speak passwords
  1. Open the Settings
  2. Tap on Additional settings
  3. Tap on Accessibility
  4. Tap on TalkBack
  5. Open the Settings
  6. Enable or Disable Speak passwords

Oppo Instructions