The width of the louvres (or slats). The wider these are, the fewer the number are used vertically.
The horizontal position of the louvre tilt rods. The Hidden option provides a switch on the inside of each shutter panel.
Split Tilt Rods at Midpoint
For Full Height shutters you can choose to have the tilt rods split at your window's Midpoint allowing the top and/or bottom louvres to be open or closed independently. The Hidden option provides two sets of hidden switches.
Please note: This option has no effect with Café or Tier on Tier Shutters.