What is Pinning?
Pinning means that you are locking an object to the front of the design, for instance a Headline. As you scroll, the content will scroll under the pinned object. You can pin objects to the top or the bottom.
How to use Pinning
Choose the object you want to pin then navigate to the right-hand column properties and then from the drop-down "Pinning" menu choose if you want to pin to top or to bottom.
Then go back to the object on the page and right click on it. Make sure it is set to "Move to Front".