3D Compositing with Action > Action: Surfaces > Adding Drop Shadows >
Adjusting Shadow Softness

You can adjust the softness of a shadow using the Shadow field in the Media menu. Use a value of 0.00 to have a distinct shadow. Increase the value to soften the shadow.

Shadow softness is a property of the media. If you add more than one shadow for the same media, all shadows are softened by the same amount.