When ABC (Create/Edit Bridge) is grayed out and you want to change the span length you will need to open Precast/Prestressed module and change it in the Geometry tab.

• If the bridge is along a curved alignment click on Layout and change the station for the supports:

• If the bridge is along a straight line/tangent then the Flared Girder will be OFF in the Precast/Prestressed Module > Project tab.  For a one span bridge you can change the Span data in the Geometry tab:

• For a multi span bridge along a straight line/tangent,  in the Precast/Prestressed Module > Geometry tab click on Add/Edit Multi Span and change the span data as desired: