Esri Case #03703536 - Deleting domain deletes the domain value only instead of entire domain
Also, right-clicking > Delete on the domain value (code/description) row header deletes the entire domain. Whereas I would have expected it only to delete the specific domain value (code/description).
Support says: ...the Esri Inc analyst confirmed that the correct procedure to delete the entire domain with multiple codes before saving the changes is clicking twice the domain header row and then right-click, selecting "delete" and the domain along with all the codes will be deleted.
That behavior is unexpected/unintuitive, but it sounds like it is working as designed.
Idea: Right-click a row header once in the domain or domain value (code/description) section to delete that specific row, before saving the domain.