Once you've joined a library, use the Author picker button to see who else is in the library, view their books, or view all books.

You'll see this toggle switch in the top centre of your screen. You can view the authors in your library by clicking on the toggle on the right:

Once you've clicked on that toggle, you'll be taken to the author picker page where you can see all the authors in your library and all the books they've created.
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If you want to see the books created by a particular student then click on their name and you'll be shown all the books that the student has created.
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First bear in mind that all books in the library will be read-only (unless you're the library owner). Students won't be able to edit each other's books unless they've turned on collaboration for their book.

As the owner of the library, you can access the Library settings to toggle on/off whether or not students can see each other's books.

For students, the dropdown looks like this: