I was wondering if the Moodle version might be a factor. I am using Moodle 3.3 - maybe that's why I don't see the same drop-down list.
Somehow I deleted the book without realizing it. I deleted the Resources section a few times and then rebuilt it without the book. It worked. The first couple of times it was still there.
Thanks for your comments!
Book
How to Delete a Book
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