Maybe I didn't understand the process? I'm going to Operator-Edit Screen, then click on wx4, change Design Height, hit enter, then Screen-Save Screen, then back to Operator-Edit Screen (off).
I do understand what you are saying about the changes needing to be small for this to work. I've been changing the height in small increments and somewhere around 760 is where it needs to be to see the entire screen. Any lower and the History, Profile, and Screen line is cut off. I'll post a pic. Take a look at the buttons.