Thanks for the quick responses. I have tried clicking on the blue Library 87 books box. Even though mousing over the box says "Click to see the books available on your computer. Books located at...", nothing happens when I click it.
I have also shut down Calibre and re-opened it, thinking that could clear its memory. Didn't work.
Here is the requested screenshot. (I am sure it is a "dumb user" thing.)
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