Tirana, if you haven't created any virtual libraries or None is currently selected then the button should appear as "Virtual Library", and if the search bar is empty then alongside it there should be "(all books)"
If a virtual library is selected then the button will appear as "Virtual Library", and alongside it there should be "(n of m)", where 'n' is the number of books meeting the current criteria in the search bar and 'm' is the number of books that meet the search criteria that defines the virtual library.
To deselect the current Virtual Library click the button (or Alt+R) and select None.
In the Auto Add feature you can exclude formats but I am not aware that it can be made conditional on the presence of other formats.
Maybe you could do a (formats:"=MOBI" or formats:"=EPUB") and formats:"=PDF" search and use the remove specific format to get rid of the 'superflous' PDF's.
BR
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