Quote bubbles and callouts have special editing controls. With these, you can adjust how square or rounded the shape’s corners are, as well as the thickness and length of the shape’s tail.
Select the shape, and then do any of the following.
To make the corners more square, drag the blue editing point on its widest edge and drag it toward the shape’s tail. Drag away from the tail to make the corners more round.
To make the shape’s tail thicker or thinner, drag the blue editing point at the intersection of the shape’s tail and body, inward or outward.
To make the shape’s tail longer, drag the blue editing point at the tip of the tail inward or outward.
To make the shape’s body taller, shorter, wider, or narrower, drag the selection handles on the shape’s bounding box.
To learn about manipulating and aligning shapes, and changing their general object properties, such as color, border style (stroke), size, orientation, shadows, and more, see About Manipulating, Arranging, and Changing the Look of Objects.
To learn further details about modifying specific types of shapes, curves, and lines, see: