Since he probably only use the space during the day why worry about opening and closing it just leave the solar shade down

Window film.

There is one that darkens only when sunlight hits - like the indoor outdoor sunglasses -

https://www.decorativefilm.com/ultracool-ir8675t-75-30-vlt-transitional-ir-solar-film

Yep, I agree with the window film, however, are you sure that's the best location for the desk? I wouldn't want to face the wall. I'd want a view of something as I worked.

How about hanging a piece of stained glass in the opening? I think something like this (or even this exact piece, which is 20” x 22”) would look beautiful:

From the description: Original early 20th-century salvaged Chicago arts and crafts style interior residential stained glass window fabricated by the Foster-Munger Company, Chicago, Illinois. Measures 22" (h) x 20" (w)

(one of two) Salvaged Chicago stained-glass window

Why not get a solar shade with a remote? That way he can raise and lower it at his will without moving. And if you think his office is messy, you should take a look at my husband's home office. ugh.

Thanks for all the suggestions. @patricia colwell consulting, just leaving it down is a likely option. I can always pull out the kitchen tongs for the few times I need to operate it lol. @jennifer hogan, film is an option to consider. @beverlyfladesigner, believe me, that discussion’s been had. I agree with you, but I’m just so glad to get all that stuff off my kitchen island, I’ll basically let him have this in whatever position he wants!:) FYI, it took seven years to get it out of the kitchen!!!! @sammy, that’s a good idea, but I like clean light into the room. @smcf03, I hadn’t thought about a remote, I’ll check that out. I appreciate everyone’s help.

I would suggest a blackout if you don't want sun to get in. But if you'd like the sun in I will suggest to have a light-filtering shade or a solar screen roller shade which protects you from the sunlight. Here is an example of a light filtering and solar screens are similar. Feel free to contact us!

Residential Window Shades · More Info