How to find some Apps in SAP Fiori Apps Reference Library?

Hello,

My client works on a system SAP Fiori based on SAP S/4HANA version 2020.
When I go to the App Finder in SAP Fiori, I see the following App names.
- Work Center Assignment to Cost Ctr (transaction code CR06)

- PP-PI: Material Usage Analysis (transaction code MCRX)

I would like to have more information about these two Apps and look for them in the official SAP Fiori Apps Reference Library with the following link :

SAP Fiori Apps Reference Library (ondemand.com)

When I look for both Apps in the Library, I have the "No Apps found message"
Example for the CR06 transaction code

Does someone have a tip on how to find these apps in the SAP Fiori Apps Reference library, or if some apps don't appear in the official catalogue?

I appreciate any help you can provide.

Best regards

Nelson