You can quickly filter your book list by clicking on items in the Library Explorer or using the Search. But if you want to select books by several conditions (i.e. Genre, Author, Publish date) - you can use the Filter Builder tool.
You can open the Filter Builder pane from the Books menu.
To create a filter - just drag items from Library Explorer to the Filter Builder. You can set either OR or AND logical operator between items. You can also use brackets to group some items and build more sophisticated filter conditions.
To apply filter - click on the appropriate icon in the Filter Builder toolbar.