Which books can be borrowed by students and which by teachers?

Even if you maintain one shared library for both students and teachers, each of them can only see the books that are intended for borrowing for their group. Students can see and reserve books for students, and teachers can see and reserve books for teachers. If you don't specify the group, everyone will be able to borrow the book.

In the "Books" section, click "Edit" next to the title for which you want to set the group.

Choose from the options: all/students/teachers.