There's only an option which allows to draw the contour of each polygon drawn by the program and this option can be activated in Pan3DView plug-in, but this option will show many undesired lines in a side view as shown in the following image.

The undesired lines seem to be of little/no consequence in the use case envisioned, which is:

Import of SH3D Display side view plugin png image (which includes polygon contour and at as high a resolution as possible) to Inkscape as a basis for tracing sectional vertical elevations therein.

However, from what I can tell so far, SH3D side view plugin window output is different based solely on Operating System (Win7/Win10). On Win 7 this image, seems to, show the polygon contour in the Display side view plugin window:

https://postimg.cc/hhhkfJYC

But is not present in the Win 10 equivalent.

Again, from what I know, both Win 7 and Win 10 SH3D setups are identical and pan3d view settings, relating to the screenshot image, on both are "Outline/parallel projection".

For the use case it'd be nice to have the side view window also have the polygon contours in Win 10.