When entering a password on the OnePlus smartphone, by default the characters you type are displayed briefly until they change to an asterisk (*) symbol.

Those who insist on additional security can deactivate this function and thus protect themselves from prying eyes.

Android 10 | OxygenOS 10.0
Show passwords -  Open the  Settings
Show passwords -  Tap on  Privacy
Show passwords -  Enable or disable  Show passwords
  1. Open the Settings
  2. Tap on Privacy
  3. Enable or disable Show passwords

OnePlus Instructions