Calibre sending books to on a device

I am using Calibre to send books to a Kindle (KT2) and to a Lenovo Yoga 2 Android tablet with the Kindle app installed. The KT2 finds the books fine, but the Kindle app does not.

I looked into this on the tablet and found that Calibre is placing the files in a books sub-directory when they are expected in the kindle sub-directory. Is this a configurable option somewhere? I don't see it in the preferences. Alternatively, does anyone know a way to configure the Kindle app to look in the directory that Calibre places the books in?

Dave