can i change Louvre window default maximum width

Is there a way to control the maximum width of a louvre set?
For example in the window below, at this width two louvre sets are created, but i want only one.
(this would be an exaggerated example, in reality i just need the louvres to be allowed to be 100mm wider that what seems to be the default.
Screen Shot 2015-10-15 at 11.05.42 am.png