This window does just what it promises - shows the content that you are searching for. You can choose what modules are allowed in the search results. This way you can create separate search pages for you articles, products or videos.
There are many presets to show your article list. But if you don't like any of those - you can always create your own by selecting the "According to template" option in the Image tab of your article list (Article list > Image position > According to template). You do need to know some html and css to do that though.