How to Disable the Automatic Face ID Sensor
Press the * key twice.
Enter your Master PIN and press # to confirm.
Press 2 to enter System Settings.
Press 3 to enter Eco / Power Saving Settings.
Press 3 for Sensor Settings:
1 – High Sensitivity
3 – Low Sensitivity
4 – Disable Sensor
Important Notes
Disabling automatic Face ID does not affect manual Face ID.
To use manual Face ID, tap the screen to activate the sensor before it can recognise your face.
The number 5 key will flash, indicating the lock is attempting to detect a face.