Each time I open a book in Indesign, when the book panel opens, 3 or 4 other books I had happened to open before open at the same time. There usually are several times the same book and these books are empty (do not contain any files). They are actually only tabs. I can close the books one at a time and keep open only the book I am working on but each time I open a book, the book tabs come back. Is it possible to avoid it?