Users with ‘Data Access’ have the ability to view the Data Browser tab. From that tab then can search for objects within the system, view and modify the data stored in the system.
Users with ‘Schema Access’ have the ability to view the Schema Editor tab of the UI. Then can add new objects, delete existing objects and modify the fields on existing objects.
Users with ‘Settings Access’ have the ability to view the Settings tab. From that tab then can modify data retention policies as well as import and export schema and data.