I agree with @jck910. Another choice, if you do not care for the brought in by the arch portion of the window, is to sealed it off with a piece of wood or composite material and then either paint it the same as the wall, or ordering a mural canvas online with a print of your favorite artwork; something that would go with the decor of the rest of the space. The murals are custom printed in any proportion you desire and are fairly cheap.

Thank you @jck910 and @Felix Pradas. You are suggesting a Roman Shade that is outside of the arch (like a large rectangular window), correct? Or a Roman Shade within the arch? My understanding was that if the Roman Shade is within the arch it can not be raised and will permanently prevent the light from coming in thru the arch part of the window:( Most of the Roman Shades I've seen look rather traditional and I wanted a more modern look but I'm sure the flatter type of Roman Shades can be made to look less traditional. @Felix Pradas, If I hadn't just paid a large amount of money for the window to be replaced I'd consider covering it up. I wish I had considered that before:(

Plantation shutters.

You could just add shutters to the bottom window and leave the arc open or there are alternatives for the top as well.

https://www.pinterest.com/pin/276267758372121692/

https://www.monumentshutters.com/products/louvered-arch-top-composite-shutter-no-mid-rail-clear?currency=USD&variant=12257815429143&utm_medium=cpc&utm_source=google&utm_campaign=Google%20Shopping&gclid=EAIaIQobChMIiceOmMjJ7wIV-QiICR2-0wWoEAQYBiABEgKSAPD_BwE

https://directbuyblinds.com/premium-arched-sunburst-poly-shutter/?w=24.0&h=12.0&gclid=EAIaIQobChMIiceOmMjJ7wIV-QiICR2-0wWoEAQYAyABEgLFK_D_BwE

https://www.monumentshutters.com/products/board-and-batten-arch-top-composite-wood-exterior-shutter-1-pair?currency=USD&variant=31168160137239&utm_medium=cpc&utm_source=google&utm_campaign=Google%20Shopping&gclid=EAIaIQobChMIiceOmMjJ7wIV-QiICR2-0wWoEAQYCCABEgLpDvD_BwE

Yes I mean outside the arch. Not within the arch that is dated as is that style of window. Choose a modern fabric. Look at theshadestore.com for great fabrics and different roman shades. Hang them above the window on all 3 locations

I'm suggesting a flat roman shade for the square lower portion and blinding the arch with either a blackout material o use the same fabric from the roman shade as a wallpaper to blind the arch. you can make wallpaper out of any fabric.

You could do an inside mount top down roman on the arch.

There are plantation shutters with movable louvers. If you had the upper arc part of the shutters separate, you could leave them open all the time.

You could hang sheers or curtains/drapes from near the ceiling to almost touching the floor on a swing out rod.

https://techigem.com/heavy-duty-swing-arm-curtain-rods/

I don’t understand your rational about plantation shutters and dusting.

I love mine. We have three different type of window in one large area and it unified the space.

My arch window is like yours and we opted to do this. I do need a ladder to dust the upper half, but honestly I do it once a month or so.

I have plantation shutters throughout my house. Though we do have a 1.5 story wall of windows and the top windows do not have any shutters. I will admit dusting is annoying. But at the same time, anything fabric or paper is presumably accumulating the same amount of dust and you cannot just dust them. So the plantation shutters feel like the lesser of two evils. My personal frustration with them is that when they are open, you do have horizontal lines across your view. I rarely actually swing them open unless I'm opening a window and need access.

I would go with white plantation shutters (ones that open and have movable louvers). Dusting them is very easy, and much simpler that washing/ ironing curtains or drapes.

Thank you for your comments and suggestions. The other reason I’m leaning against shutters is because the front window in the second picture I posted has grids. Once we are able to recover from phase 1 of our remodel (which may take a while) I plan to have the window replaced and without grids. But I don’t think shutters will look good on top of the grid in the meantime. I don’t particularly care for the way it looks from the outside in other homes in my neighbor who have lines from both shutters and grids. In the back of our house where shutters cover the sliding glass doors, I feel like the shutters (even when opened to their max) do not let in as much light as I’d like. I’m really leaning toward some kind of natural woven shade instead for all of the windows (including the arch if possible).

Woven wood roman shades would look great, but I would not use them on the arch. Leave the arch bare, and use a clear film on the window arch that blocks the UV rays and some heat.

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