Most shapes haves handles in the top center, bottom center, left middle and right middle that allow them to be stretched for increased width or height. The screenshot below demonstrates these handles for a rounded rectangle.
To stretch a figure, touch one of the shown handles and then drag the used finger in the desired direction. The figure will stretch itself to fit to the new location of the handle as dragging takes place.
If the Function Key Feature is enabled when the figure is stretched, it will maintain it’s current aspect ratio.
Multiple figures can be stretched in this same manner once they have been placed into a Group.