Click the colum header is the correct answer (if you right click, you see options). If the sort is in the wrong direction, click again or use the right-click option.
Note: The sort will be biased by the previous sort(s).
you sort by Title, then by Author: you should see the authors work in title order
You sort by rating, then bt Author: the list now shows the Authors books in rating bias order
Using: Ubuntu(32 bit):Oneric,Precise and XPpro SP3, W7HP(64)- - Libre Office w/Writer2EPUB