It is possible to select change the existing shape to another shape.
Select the shape which has to be changed and open the context menu.
From the context menu, select the option: select another shape...
The following screen will be shown:
Now click on the dropdown of Business Collaboration
And select another shape.
Click OK.
This can also be done by selecting mutliple shapes at once and changing to another shape. Note that this will only work when you select multiple shapes of the same type. If you select multiple shapes of different types, only the last selected shape will be changed.
