When paths are created, they have a natural center point. The Recenter tool allows you to reposition that center point. The initial touch selects the path to recenter. After the path is selected, drag your finger to the point of the new center and press the Mark Button

to recenter the path. Recentering affects how other tools are applied to the path. For instance, the Rotate tool rotates a path around its center. If the Rotate tool is applied to a Circular Arc it will rotate it around its centroid. However, you might want to rotate it around the center of the circle that was used to construct arc. The Recenter tool would allow you to do this. Here’s an example of recentering.

To restore the natural center, see the Restore Natural Center tool.