I recently bought a product called Veilish. It’s a window film made with fabric material. It’s semi-transparent, so it can provide indoor privacy without blocking the view outdoors. The best thing is that it is self-adhesive, and it can be installed and removed easily, so you don’t need an installation expert. I think you will definitely be satisfied with this product.

I doubt that I could resist the drama of columns of velvet drapes on every window! I would do one style of curtain rod all around the half circle, but in reality each window would have its own support bracets. However, a more low key treatment would be celluar shades for each window. You can get them blackout, and you might enjoy the ones that can be positioned top down or top up, and they can also be "accordioned" from both ends to have the shade float in the middle, so light comes in at the top and the bottom

I would do something simple like Hunter Douglas Duette shades in their opaque fabric with the top-down/bottom-up option. They can be easily inside or outside mounted, depending on space available. Here are mine in my master bathroom. See how I have the top rail lowered to be able to see outside, but rest of the window is covered, but still allows light through. You can have them all open, all closed or partially open like my photo. This is the third house that I have used this type of blinds throughout the house and been very happy with them.

I would extend the fabric/rod beyond the window to open up the space as much as possible. a Textured Linen panel (matching the wall color) on rings for easy open/close. Limit the decor, a small room would benefit from trim paint the same color as wall color. a simple top down/bottom blind for privacy and light control Blinds.com offers great options.