You can change the shape of a box in three ways:

• You can change the shape entirely by choosing a different option from the Item > Shape submenu.
• You can add and alter rounded corners to rectangular boxes by entering values in the Corner Radius field (Item > Modify > Box tab). You can also use the Box Corner Radius field in the Classic or Space/Align tab of the Measurements palette.
• You can reshape Bézier boxes by repositioning points, curve handles, and line segments. For more information, see “Understanding Bézier shapes.”