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yonkjunior - but you would have to close
calibre --with-library A before you could use
calibre --with-library B, that would be much slower than switching via the library button drop down options.
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RobSys52 - FWIW: I switch libraries via the book list context menu using the Favourites menu, as you can see in the screen shot I have set it up so it is the easiest item to to get at.
This works for me because I either use keyboard shortcuts or the context menu key to drive calibre; except of course for the
Program Preferences Manager panel
BR