Check out How to Customize Your Responsive Outputs with MadCap Flare’s Responsive Layout Window by Henry Manes. Here is an excerpt:
Ever wondered how the “tiles” and “boxes” on the home page of certain MadCap Flare templates respond to the screen size of different devices? If you visit our page of responsive HTML5 templates for MadCap Flare, open one of the theme previews in your desktop web browser, and then resize…
The full article is available here.