If you play with the layout settings you can get it to look pretty good on almost any device, they kind of hard to get use to and understand though.
or
You could make a generic loading screen and design screens for either a small or large screen and load the corresponding page based on the screen size…
Probably not really what you want to hear, but this is a problem with most tools on the market, but not too hard to get around if you think about it a head of time.