Similar problem as in this other post:
Freestyle Line Set should be in Render Layers ( Properties ), but is not Showing in Blender 2.79
Based on Blender 2.79 manual it should be there. Do I need to activate something. I already activated an addon called: FreeStyle Line Style SVG Export, but that didn't help.
https://docs.blender.org/manual/en/dev/render/freestyle/parameter_editor/line_set.html#edge-marks
