When accessing sensitive information, Google often throws up the sign-in screen again to make sure it’s really you. For example, passwords.google.com shows a list of saved credentials, but to actually see the email address and password you need to enter your main Google Account login.

Google is making this process faster and more convenient on Android by replacing the password online with your fingerprint or existing phone screen lock method. That includes pins and passwords, but also face unlock in the future. This applies to “certain Google services” on the web, including the first-party Password Manager.

read more at https://9to5google.com/2019/08/12/google-fingerprint-login-android/