The main screen of Adobe Digital Editions shows images of a bunch of books which were once borrowed from the public library. Most of them have a red band across the top which shows the ebook has expired.
Right-click on an ebook borrowed from the public library shows an option to Return Borrowed Item.
For me this produces an error, as follows:
"Error returning item. Server Communication Problem:
How do I get rid of the images for expired books from my ADE Bookshelf?