How to edit a Custom Field that has already been saved to an Entity Type?

Would anyone know how to make an edit to a custom field that has already been saved to an Entity Type? The “Job Department” custom field needs editing (I forgot to add each departments for selection) but I can’t figure out how to get in there and edit. I tried deleting but the API name for that field has already been saved. Thanks in advance!

I found the answer. You can’t edit a Custom Field from within Entity Type view (screenshot above). You need to go into Knowledge Graph > Configuration > Fields and edit there.