When I do a basic search, I would like to be able to collapse the list of matches for a particular book in the search results. This is particularly useful if you search the whole library. I often find I want to close the list of matches for a particular book and go to the next set of matches. I could always click on it again to see the list for that book. I would suggest the option to click on the icon for the book in the search results list to collapse or open the list for that book. This would be similar to the way various guides work.