Do you mean the Design Editor pod size or the magnification within it?
The pod can be resized to whatever you want. Change the magnification above 100% and it will not wrap nicely.
The more people who request a feature, the more likely it is to be actioned. Please follow this link.
See www.grainge.org for RoboHelp and Authoring tips
The magnification. Your answer substantiates my experience.