Top down bottom up shades might work.

you're just now thinking about this?? not during the build when you bought the window? oops.

you could have done a double hung and had the bottom portion frosted.

for a cheap fix, get the stick on window film and use on the bottom portion.

they come in all sorts of designs.

look at 'privacy window film'

blinds are also an option, but they will cost more. you said budget, so this is the cheapest. (the film)

Plus, there are only certain types of material on those top/bottom blinds and not all of them are ok'ed for bathrooms.

I like café curtains. I have them in my bathroom.

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A cool window sticker 😂😂😂😂😂

https://www.selectblinds.com/cellularshades/select-single-cell-blackout-shades.html

I'd want blackout at bottom of window. As was said already, you could have a curtain. Nicely sized however works.... watch a lightweight sheer move in the breeze.... :)

We have top down bottom up duettes, works great

Window film works great, it’s easy to apply, and remove, and inexpensive, so you can change it up when you want. The big box hardware stores carry it, as does Amazon. We’ve used it in bathrooms, and on sliding doors.

Your neighbors don’t want to see you in the buff either. I would install opaque window film from the lowest edge of window glass and up, high enough that when you stand at the wall furthest from the window you only see their roof.

Love that window sticker! 🤣 And am fan of Europe. 😊. I actually window-filmed the other bathroom window that is double-hung. But these windows have no natural line to separate top from bottom so I thought it might look odd. But after your commentshere, I think I’ll go with it. Thx!! (See my first window-film job pic here. Hope these will come out just as smooth). Thank you!!

I think blinds or curtains are your best option. When not using the tub the view is unobstructed

Although blinds or curtains are more “decorative” the impracticality of the fabric may be a problem. Find out how much water the fabrics can tolerate before going that route. The frosted sticker idea is super easy but will absolutely block light and your own view.

We had a frosted window in a master bath. My husband called me one evening while he was out walking the dog...to let me know which robe I was wearing. Window film may obscure the view, but it’s still quite obvious what is happening inside. How about a plantation shutter with top and bottom louvers that operate independently? You could keep the bottom louvers closed and the top tilted to obscure the view outside-looking-in.

Install a window flower box with strategic bushes to block their view

Many inexpensive fabrics you could hem... and lighter weight to move around the handles... or buy scalloped bottom edge.

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Pretty for a bathroom, and could cover the little header if you want - and still keep this fabric 'folded' up...

Buy valance and/or these--

I’m reminded of the song Silhouettes.

What brand are these windows? Make sure that applying window film will not invalidate your warranty.

One of our guest bedrooms faces the street with large windows on the east side. Even though it has blinds and drapes I wanted a little more privacy. I bought a window film from Lowe’s and placed on the lower portion of the windows. Real cheap solution and easily removable if you don’t want it anymore. Lists of different films to choose from

blinds are great in a bathroom, but not inside the shower. frosted film will do the trick.

I had a similar prob in my bathroom and put in a stained glass piece to obscure the view. It is dark out, so it doesn't show all that well in the pic, but it is beautiful when the sun shines in during the day. I wonder if something like this could be an option?

Is the window by a tub without a showerhead?

Window sticker is the winner here.

I think the top down, bottom up shades make the most sense, if you can guarantee privacy, and if they don't interfere with casement handle operation.