Planner Item.Shape psTool

What does the Item.Shape := psTool setting do. There is no mention of this in the manual. Visually, I see no difference from the rectangle.

This is demonstrated in Planner demo 13

Well thank you.
In this case, I recommend using Shape annotations like - CaptionType. And
psTool - see Demo13
I think that the user should find all the necessary information in the manual. There are also links to individual demos.