Suggest the duplication of some type of blind.

Thanks! What about long curtains on each side of windows? Would that work?

Do you need light control or privacy, or are you just looking to do something decorative?

Is this what you are thinking, leaving french doors bare?

If you want curtains on both ends of the wall, still add blinds for more balance/practical needs. Not a great picture, but hope it helps visually.

Decorative and privacy