is it possible to search/sort/filter across more than one contact sheet?
You can open multiple folders into a single contact sheet window/tab and then, yes you can search/sort/filter them all at once. You can either open the parent folder and all of its subfolders as a single contact sheet, or you can open folders individually into a single contact sheet. The context menus in both the Favorites and Navigator allow you to do this.
-Kirk
