How can I "edit points" for freeform in Storyline

I want to edit a freeform shape in Storyline.  In Powerpoint when we want to edit a freeform shape, we get an option called as "edit points".  This is in the format tab under the heading "edit shape".

However, in Storyline when I look at the edit options in Format tab for freeform shape, I do not find this option. 

Here is a graphic explaining what I need.  This graphic is from powerpoint.  Hope this helps clarify the question.