Spread - Controls the distribution if there is variable width, for details read above. Min Width - Controls the minimum length a board can be. Max Width - Controls the maximum width a board can be.
Spread - If you have boards with variable length the 'Spread' setting will control the distribution between the two sizes, 0,5 the length is evenly distributed, a low Spread value creates a lot of long boards and only a few short ones, a high spread creates a lot of short boards and only a few long ones. Min Length - Controls the minimum length a board can be. Max Length - Controls the maximum length a board can be. Floor Pattern - If you have the full version you can switch between the types of patterns in the '''Floor Pattern' Drop down menu.