I guess you took this application from someone else. This roles implemented are not part of the framework. You'll need to check the code to figure out how it was implemented.

The Authorization doc may help you.

Normally there seven default user roles come with every application, each with its own set of permissions and capabilities but there are no restrictions you can create your own as per your demand:

Super Admin, Admin, Editor, Author, Contributor, Customer, Shop Manager.

But you have to check your web application code that how code is written and how many roles are defined and which roles are assigned to which user.

If you want to know more about the Role Authorization here is the link of the official documentation: https://laravel.com/docs/8.x/authorization