Is it possible to have a book not appear in the drop down menu

I’m working on creating an App that may use Screens to aid in navigating various books. I can add a book to a screen and then have only the books in the screen appear when you select a screen. But when I’m in the book, every book in the app appears when I click the down arrow next to the book in the book title.

Is it possible to either

  1. not have particular books appear in the drop down menu
  2. configure it so a particular book only displays a subset of books?

@Scott_Dysart You can turn off the drop down menu for books, but sorry, at the moment you cannot tell the app not to display certain books. We will note this as an enhancement request.