I don't know if this is a limit of the free version of Zorro or if I'm doing something wrong, and if something isn't explained well, you can ask, I thank you in advance.
It is. The Accounts dropdown feature only works when you have the Zorro S license.
Account lists are supported with Zorro S.
https://zorro-project.com/manual/en/account.htmhttps://zorro-project.com/manual/en/restrictions.htm