Minimize all Frame windows at once?

[Nancy Allison]

Hi, everyone.

I'm working in a document with about 20 chapter files.  Before I do a 
book-level search, I usually have only one chapter expanded and all the 
others are minimized at the bottom of the Frame window. During the 
search, Frame expands every chapter and leaves them all expanded after 
the search.

Is there a way to minimize them all at once, so that just the Book file 
remains open and everything else is minimized at the bottom of the Frame 
window? I googled this but found nothing.

--Nancy