Can I make the curtain more see-through or more solid?
Short answer: Yes. Use the Panel background slider in Settings → Advanced → Junk Yard Edge Curtain to make the strip more see-through or more solid.
Yes. Settings → Advanced → Junk Yard Edge Curtain has a Panel background slider. Move it one way for a more see-through strip, the other way for a more solid one. The curtain opens while you drag so you can see the result.