link doesn't work!
What I mean to say is that when you resize the browser window, if you have different layouts, a different layout is presented at certain breakpoints (pixel amounts). In your example above I can see there is a breakpoint at about 1080px, 1350px and 1920px. At each breakpoint the corresponding layout is served. Thus, you have a different view when you resize past or below these breakpoints.
In hype you can set these breakpoints when you create layouts.