-- Set points= 0.0 -- Back to mess index

In this example I used the default shape "Arc" and made it editable. Then select the top and bottom points. To do this (if you dont know) Choose the selection tool, select one point, then while holding the shift key down, select the other point.

By clicking on "Set points=0.0" It will drop the selected points to 0 on the desired axis.

Note: This was all i could find for this function.