As always, the logic works only as well as the indexing. You may combine your keyword search with a category search. The list will continue to expand until you've reached the lowest level. When that happens, the plus sign will change to a minus sign, or on the Mac, the arrow is turned down. You may use OR but not AND or BUT NOT when you search by category because each picture may only fall into one category or subcategory.
Search results display only as thumbnails or chubbies.
You can, however, return to the thumbnail by closing the enlargement window. To return to a contact sheet after enlarging the picture, select Window and the search strategy that represents the desired contact sheet. Set page, image, frame, margin size, and number of columns on the contact sheet by selecting Screen Settings from the Options menu. To see the text accompanying the picture, position the mouse cursor over the picture and press the right-hand button. You may also select Image information from the View menu.