Drapes will be challenging with the difference in wall space & having the big couch in front of both. How about something like Roman shades or woven woods & mounted at ceiling height? You could still do white. What’s the plan for slider? With my suggested alternative that window could have a similar treatment which would be good I think since the 3 windows are on same wall.

Agree with KW. But I would do just woven wood inside mount shades on the windows then on Sliding doors White linen curtains

I would use roman shades on the windows, mounted above the windows for maximum light. They will also allow you to place your sectional closer to the wall without interference from drapes. If you need a covering for the sliders, you can use drapes there, with matching fabric shades on the windows.

Plantation shutters would work here too. That’s what I have behind my sectional and on my sliders, I have issues with wall clearance on either side as well. Also I’m not a fan of long drapes behind a couch, just seems like too much fabric on fabric.

You would lose a lot of light with plantation shutters on these windows, and you could never open them. Shades would allow light from the bottom when fully or partially opened.