Stuff you configure in the UI is mostly stored in the database, not as YAML. Nearly everything you've configured using YAML is not editable from the UI. Whenever an integration moves from YAML to the UI (like the Proximity integration in a recent release), the YAML config is deprecated.

There's a few exceptions where YAML is stored in the DB (like if you have dashboard cards with custom configs) but YAML is going away over time as the UI gets more powerful, and is mostly just becoming a power-user thing.