https://manual.calibre-ebook.com/vir...l-restrictions
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You can further restrict the books shown in a Virtual library by using Additional restrictions. An additional restriction is saved search you previously created that can be applied to the current Virtual library to further restrict the books shown in a Virtual library. For example, say you have a Virtual library for books tagged as Historical Fiction and a saved search that shows you unread books, you can click the Virtual Library button and choose the Additional restriction option to show only unread Historical Fiction books.
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There's an option on the menu to use the current search. However, this saves it in the menu.