Use the shape tools to add lines, arrows, rectangles, free-form polygons, and other shapes. To the right of the shape tools, there are options to control shape and line colors, opacity, and line weight.
Select Show Shape Options to display specific options for each type of shape. For example, if you select an arrow, you can control whether arrows have arrowheads at their start and end position or both. If you select a polygon, you can specify the number of sides. Other options include start and end angles for arcs, X and Y coordinates, Width and Height measurements, and the corner radius measurement for rounded rectangles.