How to: Change AutoShape shape in a PowerPoint presentation.
Solution:
Select the shape, and select the 'Draw' menu and select 'Change AutoShape'.
1) Select (single-click) the desired shape to change.
2) Select the 'Draw' menu and select 'Change AutoShape'. (A submenu appears.)
3) Select the desired new shape from the 'Change AutoShape' graphical submenu. (The shape changes.)
Change AutoShape submenu
4) Click outside the shape to deselect it.