Whats the best number of shutter panels for each window? For the most part, the larger the window, the more shutter panels you’ll want on it. The optimal design is to use one panel for windows up to 26 inches wide, two panels for windows up to 50 inches wide, and four for windows up to 98 inches wide.Single wide panels are not as user-friendly as multiple separate panels. Sometimes, wider panels won’t fit flush against the wall because of their size. Multiple smaller panels resolve that.For any windows that you may open or shut regularly, you’ll be better suited with multi-panel shutters, since they’re easier to open and have more support from the shutter frame when you do operate them.