Problem with Display and Sort Names


I’m not sure if this is the right place to ask this, so please forgive me if it’s not.
I’m editing my Author pick list to normalize it. I remember I had in that window two fields for Name and Surname, that made easy for my to fix the sort and display names.

For some reason, now I don’t see those fields anymore. See the attached screenshot. Please advise.

Book Collector only has Display Name and Sort Name. This was changed last year: