To expand a single fileset one simply clicks the + sign on the far left of the row.
But I always want to expand all the filesets in my queue (primarily to monitor whether the data is missing or from my fill server's block account, each of which sometimes happens when it gets pulled down mid-download). Sometimes like now (when I've got multiple seasons of a TV show in my queue) that's many dozens of filesets.
I'd love some way to expand all (or all selected) filesets in the queue; perhaps a right-click menu option?