Not quite what I wanted. The books that are not in any collection used to show up on the Home screen even when the righthand dropdown was set to 'Collections'.
New sideloads to the Kindle would appear on the Home screen. Then I would put them into which ever collection they needed to go into OR they would get left as they were to appear on the Home screen along with all of the collection names.
I'm finding this hard to verbally explain, so let me know if I still haven't gotten it clear.