S-Finder is the Search App. It finds almost anything in the device. You just have to type or write the text. So if you are searching for any photo or video, or web page just type the same in search box and you will get similar results.
Step 1: Enable Air Command from Settings > Controls > Motion Control > Air Command.
Step 2: Hover S-Pen over Screen by pressing S-Pen Button to launch Air Command. Select S-Finder from Air Command Menu
Step 3: In the search box type any text to search.
Step 4: You can apply different filters to configure the search. Tap on results to view.