The template's percentage does change when the window is requested but it takes up half of my monitor screen & I have a pretty big monitor... to see all the template fields we built in.  It needs to take up more of the gray border or fit to the window.  Do you see what I mean in my screen shot below?  The blue template should fit better and I should not have to have it this big, if not we don't see all of our fields all at once which is preferred.