How can I make the window bigger so I can see more of the form in Forms Viewer within step-bystep mode?

Some steps in the Interview mode show form in a small viewer window, , a teeny box shows about 1/5th of the form height, and enlarging the application window doesn't enlarge the box. It's really annoying and makes working with the form very awkward. Is there a way to unlock the tiny box and view more of the form?