[rjwse@aol.com]

Here's a tip in case anyone might have need of this. The calibre main screen lets you open the epub editor with T, the epub viewer with V, but calibre does not have a built in pdf viewer. I have assigned ctrl-e to open pdf viewer evince and ctrl-o to open pdf viewer okular. There is no special reasons to have two different pdf readers but I occasionally try to detect if there are any differences. One thing I noticed is that if you use calibre's main screen to Polish book and add Soft hyphens those soft hyphens will make it hard to search a pdf.