The admin interface is generated through Kaffy. You can find extensive documentation on the Kaffy site regarding how to use and customize your admin interface.
Legendary specific notes:
- The configuration for Kaffy in your Legendary app is located in config/admin.exs.
- Many of the built-in schemas provide admin modules. You shouldn't generally need to change these, but you may want to do so if you are changing built-in schema modules.