Automatic Grain Alignment
Setting this option will automatically rotate parts 90 degrees, if needed, to align the grain with the targeted board's grain direction which can be configured to be horizonal or virtical. This will only affect parts that have 3D appearances applied such as appearences found in the Wood (Solid) category.
Wood grain is often aligned along the longest edge length which matches MBP mapping. MBP will by default align the longest edge with the targeted board's grain direction. The Texture Map Controls, available by right-click on a select part, can be used to rotate the visible grain to make it more aesthetically pleasing. Shown here is Texture Map Controls being used to rotate the grain 90 degrees on a cabinet side and the resulting map created for this side when this option is set. The side is vertically oriented but the grain is horizontal matching the targeted board's grain which in this case was set to horizontal on the created map.
Note: The parts must be contained in a fusion component in order for grain alignment to work reliably.