To delete a custom rhythm:
- Go to Automation
- Select Rhythms
- Tap on the room for which you want to delete a rhythm
- On the top of the screen, tap on the custom rythm you want to delete
- Tap on the "..." button next to the rhythm name
- Tap on the trashcan icon in top right corner of the screen, and confirm
Circadian rhythm is a default settings and cannot be deleted.