There's a few different ways of doing this - the cleanest would be to setup two different calibre libraries, one for her, one for you. I think it is possible to setup a desktop shortcut to open the relevant library automatically rather than requiring you to manually switch.
Alternatively you could keep all the books in the one library, but use a tag, custom column or some other sort of criteria that you can put into two saved searches - one for you, one for your wife. Then use the "Restriction" dropdown up the top left to restrict the view of books to just those of relevance.
|