The toggle to enable the Screen-off Fingerprint Unlock feature is missing from Android 16 Beta 4, but it’s still possible to enable it via a hidden command.
Screen-off Fingerprint Unlock allows Pixel phones to use fingerprint unlock even when their screens are off.
The feature was first introduced in Android 16 DP2 for the Pixel 9 series but later expanded to all Pixel phones in Android 16 Beta 3.
The feature makes the fingerprint scanner always active, so users can unlock their phone by pressing their finger on the scanner area even when the screen is off.