In the tool's dialog, choose to define the helical spiral by windings or pitch. Type the number of windings or the pitch for the helical spiral.
Pitch is the length per winding.
Click on a side of the cube control to change the current view plane. See the Spiral tool for an explanation. Select Fewer Points if you want excess points to be removed from the polygon placed. This sort of filtering is automatic with the Spiral tool, but it's optional here since it can create some rough places in the spiral loops. Select in-plane if you want to place or draw the helical spiral directly in the current view plane.