I was thinking wooden shutters. But now that you mention it, you could use a shutter frame with inserts made of fabric, or even punched metal, etc. Shutters are great when you want to the option of opening them to allow full sun and view. But when I re-read your post, your window treatment is for privacy, so maybe window treatments could be fixed. In that case, I could see a sheer or lace panel, or sheer gathered curtains, mounted inside the window frame, and ending at the window sill. That way, you're free of the radiator, and the pretty wood trim and the glass arch are visible.

I think this is one of these things that should have a "post-game analysis" of sorts. I don't mean to be critical, but this will be analytical and it may help someone else who builds a house in the future. The idea here is nice, and the essentially linked windows are similar to a true palladian window, with the tall window in the middle and subordinate windows on either side of a height equal to the bottom sash...fine. But you've kind of backed yourself into a design corner because these particular windows need to be covered, and yet you don't want to cover them too much, or all the time. A palladian window in an 18th or 19th c house would be treated like this: The walls would be thick enough that shutters would fold over the small windows and fold back into shallow pockets in the jambs when you wanted them out of the way. The larger window would be elaborately draped because of the curve or possibly mostly left bare,depending. If you were to design this over again---or if your architect does do this again in another house---a peak that was wide enough to allow a single rod or top mounted treatment that was wide enough to cover all three windows completely should be one thing considered, or more room for shutters to be folded back would be another, a shorter or differently proportioned window in the middle another. I think that windows are often designed as if they can all be left uncovered because nobody's windows need to be covered for privacy or light control. And really the opposite is true. Almost Every window should be designed if it will need to be covered for privacy or light control, and if it doesn't great, but if it does you are not faced with several less than ideal options and possibly some really awkward options but no perfect options.

Jennifer - This is something I decided just in the last week….so not really anyone else’s fault. If they had asked me at the beginning I would have just said I needed a solid wall for desk. My builder was a go between with architect and honestly, not sure they were that great, so I’ve figured out a bunch on my own re furniture placement etc. We’re kind of doing what I would think of as a mid range custom home. All of the things you mentioned are things I have considered in my current home and is easily transferable. I’m a college professor…so not a lot of huge needs. Having a desk space in the center allows me to look toward window and be able to glance back toward the doorway. Printer drawer next to desk. 2 acre property so no concerns for privacy. Plug ins below desk area. Room for desk light angled behind desktop. Large enough desktop for monitor and keyboard. Lenox - since the doors are a bit closer to the kitchen, I’m ok with placement. With the open floor plan I am losing one solid wall for artwork, but I can work around that easily. For me, it was important to be connected to the living room and be able to have some visual path to the back patio door for letting dogs out. Placement off the foyer would kind of cut me off from where everyone else is. I also like super easy access to the kitchen as I often bake while in horribly boring meetings and can hear the computer if doors are near kitchen.

top /down ,,,bottom up style ....hung so semi circle portion is left free.....i think you can get motorized ..keep the control in a little drawer and when the glare is in your face you can adjust any way you want or leave the glass open at times where glare is non issue. this is not the cheapest route but because of the features and way it would be customized w fabric or material selection...control or strings etc, it is a nice flexible and permanent treatment for this spot. not sure what other motorized selections are available now.....have a look at a custom window treatment place closeby. my neighbor has a sectional couch in her bay window alcove and they have the motorized control for ease for her top down selection on the three windows that you cant reach very well. you just have the one window.....go for something that serves the functions you need. here's something new I think....the portion installed separately in the arc....would you need that?