Edit:
We’ve released the Scalable Dashboards feature which accomodates this request.
The current recommendation would be to either design additional dashboards for the different target devices or to adjust the size or zoom of the browser window on the computer browser to your desired target size. For example, I have some dashboards which work well across phone, tablet, and PC… and others that are targeted specifically for my phone or specifically for the wall tablet.
We have it on the hit-list to revisit additional layout approaches at some point in the future - at this point we’re focused on building out features using the current fluid grid layout. Thanks for the suggestion!