The Library contains all the books you have downloaded to the Bible Study App on your Windows Desktop computer. To access the Library, tap on the open book icon in the upper left.
The screen that appears will look like this:
Clicking on a book from the list will open it in the main window of your app. You can see the options to the left side of the screen that will allow you sort your books by category. To add a book to your Favorites list, tap the yellow star: