Stoke Preview Window

This "Stoke Preview Window" in my work and use -- sure could be a lot larger...  It can be widen as far as I can see, but it cannot be made any taller: when adjusting the spread of oil bristle brush the brush completely goes on the screen, and you can't really preview the brush....  Yes, yes the stroke preview window could be twice the size it is and still be too small, but more useable....