Fan Direction: Advanced Tab

Position and select the desired openings.

Enter either the Horizontal or Vertical Fan Distance.

Click the Set Fan button next to the Horizontal or Vertical Fan Distance entered. 

The openings will be fanned by the Distance entered.

You can click on the middle Fan Control Point and drag it to increase/decrease the fan as well.

If the fan is unselected (i.e., the mouse is clicked elsewhere on the design), reselect the objects and click Set Fan to reinstate the fan function to continue editing it.