After digitization or after various operations during design process, the pieces can be rotated from the standard position in which the grain axis is oriented horizontally or vertically. It may be difficult to do operations between pieces if they are not accurately oriented.
To align the pieces by the grain axis, select one of the four functions from the Piece working mode. You can arrange the piece(s) previously selected either vertically or horizontally. Depending on your choice, the pieces will be aligned by the grain axis accordingly.