This article explains the exact relationship between Libraries and Content for Standard Libraries and Cloned Libraries.
...
Project Summer Camp → Cloned Library Math Intro
Steps on how to clone a library in Rumie Management Center
Can Cloned Libraries be changed after they have been created?
...
Once your Library or Libraries have synced successfully on your device, you can start viewing the content. The Content for each Library is unique and you will have a separate view for each of your Library. You can select your Library by selecting the (☰)hamburger menu on your left, navigate to "My Libraries" and select a Library from the "Select a Library" pop-up. Clicking on the radio button (O)next to a Library name and then confirm by clicking "OK", your Content should be available then.
Accessing and using Libraries on the Rumie App
What version of the Rumie App do I require for being able to use Libraries?
...