After the Curtain Wall is placed, select it and click the
Edit in 3D tag that appears.
In 3D, select the Curtain Wall, then click the
Edit tag that appears.
In the little palette that appears in the upper left corner of the 3D Window, make
Schemes visible and hide Frames and Panels. You will now see the boundary of the Scheme.
You will probably see a Grid and you will also see another
rectangular boundary with thicker contours: this is the polygon of the Curtain Wall and by clicking on any of its edges you can edit it just like any polygonal shaped element in ArchiCAD: offset etc. Click on its upper boundary and increase it to the desired value or offset it with the desired value.
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