Disable nickname field for Buddypress registration form

Hi. I'd like to disable or make the Nickname field optional when using Buddypress. I added fields using the BP Profile Fields module and changed the Nickname field name to something else thinking that I could use it for whatever I wanted. Turns out it populates itself with the Display Name and can't be change.

I don't get it. If it depends on other fields (name, last name, username), why do I have a separate field for it? I tried this solution but the field is still visible and required during registration.