The Form Inspector lets you make adjustments to the outline shapes of balloons, balloon tails, captions and panels.
Changes the balloon shape.
Changes the balloon variety for the selected shape.
Changes the tail shape between curved, straight and jagged. If you've adjusted the curve of the tail manually then checking the box will switch the tail back to an automatic mode where the curve of the tail is calculated for you. See Modifying Tails for more information.