i would get roman shades or rollar style that are automatic. they look great and are easy to use.

If that's your actual window in the image, well, they look like cheap windows so I wouldn't get too worked up about how you dress it.

Nobody cares from outside but it’s not going to look “correct” of course. But who cares?

If you want to stick with the curtains and this is a utilitarian quest, you could do an internally mounted roller shade. When it’s rolled up, you will barely notice it, especially if the color is close to the window trim.

Or a Roman shade, with or without the curtains.

I think a lot depends on the other windows in the room.

Whatever you want, OP. I assure you that no one really cares as much as you. It's true that the sheer curtains would look better across the entire window.

I think it would look better if the sheer curtains spanned the width of the window, however you make that happen.

*aesthetically. Ugh.

We have a large picture window at the front of our house that is S facing. There is a soffit directly above the window trim, and because of this, the curtain rod is hung from the “ceiling”/soffit, and there isn’t room for a double rod. In the winter, the sun is particularly intense, but I work from this room and enjoy the sunlight. Would it look authentically appropriate from the street, or even from inside, for me to add a sheer curtain on a tension rod, just in the middle of the window:



The rod would be placed between the sliders, with the curtains opened only that far, which is what we usually do anyway.