Calibre Companion/DropBox

I currently use Drop box cloud storage for my library storage.

I use Calibre Companion version 5.1.1.3(327) to view my books when I'm not home.

here is what I run into. when viewing books in Companion I notice that Companion hasn't updated the new books that I've added.

is there a sync function in Calibre companion that will update and show the new eBooks?

thank you for your time.