Nook Books don't appear in Windows 10 or Calibre

[Loriss]

When I connect my Nook Color to my Windows 10 PC or Calibre, the Nook itself appears, but it shows no books (there are 800+ on Nook). On the PC, when I click the "Books" folder it is empty. Why?

[CJ]

I don’t believe Nook books show up on your computer, as in you can’t move them to and from your computer. They reside in the clouds. Unless these are side loaded books, in which case I’m not sure why.