Thanks for the additional info Brad! An option to adjust the margins would be useful, so we are considering that for a future release.
However, I'd challenge your perception that limiting the length of story is most helpful to your readers. We're thinking about publishing a blog or "How to Cascade" story about this, but what our team's research and experience shows is that readers get more fatigued reading wide blocks of text than they do scrolling through a story. Newspapers and magazines have always used narrow columns rather than lines of text that go all the way across the page, and the clear direction of modern web design is narrower text blocks and taller pages to improve readability and focus.
We also recommend using left-aligned text for paragraphs. Centered text is ok for headings or short quotes, but giving readers an anchor point for their eyes to go back to at the end of each line is much less fatiguing than center-aligned text where each line starts in a different vertical position.
Check out popular news websites or blogs (NY Times, Medium, etc.) and you'll see these design principles at work.
Hope this is helpful!
Owen
Owen Evans
Lead Product Engineer | StoryMaps
