Returning to Illustrator after not using for a long time.
How can I permanently show paths created for example by the pen tool when I create them with no fill or stroke attributes - for example a set of contours?
If I set the view to outline (control + Y it does this but puts them on a white background meaning I can't see underlying layers.
What am I doing wrong?
You can set layers to outline mode individually.
Hold the Command (Mac) or CTRL (Win) key and click the visibility eyeball icon next to the layer name in the Layers Panel.