On the Define tab, click Design Space > Obstacle Offset .
The Obstacle Offset dialog opens.
On the canvas, select an obstacle geometry body to assign the offset.
You can select one or more bodies. Bodies with an obstacle offset applied are not available for selection.
Specify a distance by which to offset the obstacle geometry body.
Distance must be a positive value.
Click OK.
The increased size of the obstacle body displays in red on the canvas and is semitransparent.