Does it exist? I would like to set the opacity/transparency of a layer in the 2d drawing (a manually sketched draft), but can't seem to find a setting.
You can create layers that are hidden/turned off and move geometry to that layer. But there's no transparency setting, unless someone knows a secret setting. Think of it as drawing on a piece of paper.
What you see in the Layers dialog is what you get. I suppose you could export the drawing as an image, either JPG or PNG, but you'd be limited on the size, I think.