The Align to Centroid submenu moves the selected shapes in the Shape window as a group so that the centroid of the area of the selected shapes is aligned with the origin of either or both of the x and y-axes. You will usually use this command prior to installing the section in the Sections Library as it will make the calculation of all the sections properties relative to a set of axes passing through the centroid of the section.

Aligns both x and y centroids to the x and y axes.

Aligns the x centroid to the x axis

Aligns the y centroid to the y axis