To change the warp type

1. Select an object to warp or an object previously warped.

2. Click the Edit tool in the toolbox.

3. Click Warp in the menu. A blue warp envelope appears over the object.

4. Click the Warp Type button in the ribbon then click one of the following in the menu:
   
   Edit as Line to reshape the envelope with lines and no curves.
   
   Edit as Curve to create curving lines when you reshape points on the envelope.
   
   Edit as Bézier to reshape the envelope with Bézier control points. You can use the Cusp, Curve, and Symmetrical Curve buttons to modify the control points' movements.

5. Double-click or press ESC when you finish.