Used to show/hide the base element of a curtain wall. The visibility of the base element helps to select and manipulate the curtain wall. For instance, to resize or reorient a curved base element. The curtain wall follows the manipulated base curve.

Accessed from:

• Ribbon: Building Design > Modification > Modify Selected > Modify Curtain Wall > Toggle Base Curve

When executed, makes the base element (line, curve, arc) visible.