If you have the Segmentations setup in Lead Database, then what you should do is layout the default elements on the Page.
Then click the Gear icon and do Segment By. You will then see options to choose which Segment to view. Once you choose the Segment, you can modify the text, image, or Form to match.
Watch the lower right corner to see the Elements and Segments for each element.
I have all of my default settings up and I clicked on the gear icon and chose my segmentation. The form is now under my segmentation and I edited to display a different form. However, I don't know how to view my default form. All I can see are the elements with the dynamic content, but I cannot see my default elements.