Configuration.yaml not showing any settings

hi
my yaml file is default and I have HomeKit Bridge installed and all working fine.

however I want to change one of the contact sensor to a

linked_doorbell_sensor string (optional)
The entity_id of a binary_sensor or event entity to use as the doorbell sensor of the camera accessory to enable doorbell notifications.

how should I proceed, till now all my configuration or setting of home assistant is via the UI interface.

thank you
Screenshot 2024-08-23 at 11.19.57 AM