Most shapes have handles in the top, center, bottom center, left middle, and right middle that allow the figure to be stretched and made wider or taller. The screenshot below demonstrates these handles for a rounded rectangle.
To Stretch a Figure, click on one of the above shown handles and then drag it to a desired location. The figure will stretch itself dynamically as the handle is dragged.
Pressing the shift key as a figure is stretched allows it’s current aspect ratio to be maintained.
Multiple figures can be stretched at once by placing them into a group.