I was looking to modify the outline Section pen of the Masonry Arch. The Vectorial hatching specifications of the material that is assigned to the arch is does not effect the section view so it is not about the pen being set to "Element pen" or not. I do not see a place than the section pen can be set.
In a Basic wall, the pen can be changed in the Wall Settings dialog - Floor Plan and Section tab - Cut Surfaces - Cut Line Pen.
Unfortunately in Complex profiled walls and Composites, this option is not present. We have added this issue to our database.
Thanks for notifying us!