In Proton Mail for Android, Settings > App customization > App lock, there should be another option to unlock with only device credentials, AKA screen lock pin/pattern/password, but no fingerprint or face id, which is part of biometrics. I am requesting this feature because fingerprints and face id can be tricked, whereas a sufficient PIN or password on a user's screen lock is more secure.

This link explains more what I am asking for:

https://developer.android.com/identity/sign-in/biometric-auth#:%7E:text=Authentication%20using%20a%20screen%20lock%20credential%20%E2%80%93%20the%20user%27s%20PIN%2C%20pattern%2C%20or%20password:~:text=Authentication%20using%20a%20screen%20lock%20credential%20%E2%80%93%20the%20user%27s%20PIN%2C%20pattern%2C%20or%20password.