How about a patterned roman shade like this?

Ah, didn't notice that. I'm actually not sure that you need curtains in that space as the windows are lovely and there isn't much wall space on either side of the windows. You have a lovely house.

You don’t have a lot of room for panels on either side of the windows, even non-operational ones are going to be crowded.

You could do a valance, but you would have to do the dining area windows too, as they are in sight and the same height. My thought is to skip curtains here, but I see the slider which could use something.

Are you looking for ready made?

As to color…no to the navy blue.

Yes - we have the sliding door in the breakfast area as well which makes it complicated. I was considering a lighter blue from CB -

https://images.crateandbarrel.com/is/image/Crate/LindstromBluCurtainPnl48x84SHS17/?$web_product_hero$&170517110021&wid=625&hei=625

Maybe I am not seeing on my monitor what your colors are…I see dark gray, a taupe wall color, black furniture and dark brown floors. The rug looks gray and beige….

As to your C B panels, I think the color is wrong (again, I may not be seeing the room as I should), and they are not lined. If any of the fabric has glass behind it, the fabric is going to show as two different colors.