I'm very excited to try the new RSD V1.5 Beta in particular the Flexbox tool. In this version there is a neat solution to the screen display issue, which is now resolved by the zoom tool. This works so well.

The Flexbox introduction in .rsd format written by Bob V. is an excellent teaching guide. It makes it so much easier to understand, look in the design pane, play around with the values and experience in practice how it all works together.