When searching in the Search window, often there will be numerous hits shown. It can take a lot of time and clicking the scroller to view the many pages of results.
So i suggest that in the Search window and when By Book is selected, that the books be collapsible like that of the categories. This would allow us to more quickly make our way through the hits and find what we are looking for.
Below is a mockup showing kinda what i mean:

a) Notice that By Book has been selected.
b) The first book is shown as collapsed (similar to how My Content above is collapsed)
c) The book Dictionary of Bible Themes is shown as not collapsed.
So when we see a book that its hits are not useful, then we can collapse it and move on to the next book.
Compare the mockup view above with what we currently see below:

I have added this to the customer feedback see Here
Its titled Collapsible books in Search window
Vote on it if you like this idea !