Wind fan finishing provides a single point that is used as both the start and end points of a milled finish path.
The shape of the fan is controlled by the Wind fan radius and Wind fan angle shown below.
Note that by changing the start point, you can move the starting and ending points of the toolpath, but it will usually not be the exact location you enter. FeatureCAM will pick a point near your start point that is consistent with the angle and radius you specify for the wind fan.