The not-so-widely-used trusted face smart unlock feature has officially been removed from Android. Android Police reported that the feature has been completely removed from devices running Android 10 or below.
The feature was added to Android in 2014 and existed alongside other smart unlock features that keep your device unlocked under certain circumstances. Examples include on-body detection, trusted places, trusted devices, and voice match. None of the other smart unlock features have been removed as of right now.