Enable autofilling passwords in apps

Unlock the vault by entering the main password and tapping Unlock.
If your device is running Android 6.0 or later, supports fingerprint authentication, and has fingerprint authentication enabled in the app settings, you can use it to unlock your vault instead of entering the main password.
In the main app window, tap or swipe the screen to the right.
The quick access bar appears on the left.
On the quick access bar, tap Settings.
Turn on Autofill for apps.
The Autofill service section in Android settings opens.
Allow autofill for Passwords.

The Autofill for apps feature is turned on.