Tags help organizing books in the Library. Books are tagged at the time of adding a book to the library. Tags can be edited or deleted at any time.
At the top of your dashboard, click the module access icon > Academics > Library > Manage Tags to open the Manage Tags page.
If many tags have been created, use the Search field to search for the tag you want to edit or delete.
If you want to edit a tag then click on the tag.
If you want to see all books tagged with a particular tag, click Tagged books.
If you want to delete a tag, click the ‘x’ icon.
For more information. view this: