I had recently posted a question on how to turn insulation in plan view in windows and one of the members kindly helped me. I haven't found out how now this can appear in section view. Is it possible? I haven't figured it out... Thanks in advance!
Unfortunately this is a limitation, the closure you see on floorplan is a GDL 2D Symbol. Whereas a section view takes the view from a 3D Projection because the closure doesn't exist in 3D it cannot be displayed in a section view.
Therefore you will need to manually add this detail using the 2D tools in Archicad.