Comprehensive and Detailed Explanation From SAP S/4HANA Cloud Public Edition, Management Accounting documents:

The "Maintain Business Roles" app is the central tool for managing user access and security in the SAP Fiori Launchpad

One critical activity is to assign business catalogs to a business role30303030. Catalogs are the building blocks that contain the links to specific applications and tiles; by assigning them to a role, you define what apps the user can see and use31. Another essential task is to maintain restrictions32323232. Within the app, administrators can define granular data-level access, such as restricting a user's ability to "Write" or "Read" data for specific company codes, cost centers, or organizational units33. Technical catalogs (Option D) are generally managed in the backend or during development and are not the focus of this business-facing app34. Similarly, the linkage to PFCG profiles (Option B) is handled automatically by the system in the background and is not a manual task performed within this specific Fiori application35.