replace the window with an operable awning window (min size is 17" high on those, i think) , or two side by side, at the top of your opening. fill below with wall and tile.

if you have no adjacent homes looking down on your, you can even stick with clear glass. otherwise go with frosted.

i believe ours is about 36" wide, no photo straight on of it.

as far as solutions which detract from the front of your house... i'd say a window that allows the passersby to see the homeowner in the bathroom detracts from the house far more. what was the architect/builder thinking?

For the tub under the window, a double layer accordion blind worked well. The contractor initially suggested a high transom window, until he sketched out what it would do to the front of the house and decided against it for that reason and because of the expense of revising the exterior stucco. Also, the two story house across the street is at a significantly higher elevation than ours, and the window in concern is a ground-floor window, If I have to replace the entire window, I will look for a stained glass window the same size, presuming I can find a source.

I have a window that would have been partially inside a new walk in shower. It's an old house, so it was not vinyl or waterproof for a shower. What was done is the spray paint on the inside of the window glass, so that from the outside it just looks like the regular window, but black, like at night with the lights off. It worked for me and the old-ness of the house. It might not work for a new modern style house, though. Also, a vent fan was installed to replace the ventilation the window supplied.

Then the window was drywalled over on the inside.

There is a glass insert which is lami between two layers of glass. I am using it for interior doors including bathroom doors.

When I checked it at the supplier, it was installed in their public bathroom and I had someone go in so I could see if there was any kind of silhouette apparent - and there wasn't.

It is completely opaque but does have the benefit of creating a lighter visual feel than a completely wood door would. I have no idea whether it is permissible for a shower or bathroom window especially since I would think Code (and personal safety considerations) would require your glass to be tempered

do you remember what that glass is called?

Honestly, the design is flawed if this issue wasn't bought up prior to ordering.

At this point I would install exterior shutters and install a 3form frosted glass film on the windows.

you could also look at ordering mini frosted glass shower door that get installed inside the shower.

It’s called lami glass or laiminated glass. I have no idea if it is used for windows.

Description: White Lami glass features a thin opaque film laminated between two sheets of glass. It provides total privacy and is easier to clean and maintain than traditional frosted glass.

Glass Type: Laminated Glass

Thickness: 1/4

https://www.trustile.com/materials/glass-resin/white-lami

If you simply would like to obscure the view in or out, spandrel glass comes in many external appearances.

Another option, which we took was to place a closed blind in the window, and then frame the wall over the bay window and close it off. The external appearance was kept because it's a bay window and single pane, leaded glass, characteristic of the neighborhood. Inside, tons of private light (till little Joey gets a drone...) and a nice, big shower.

I have a rental where I out up mini blinds, then dry walled the window over. Outside just looks like the blind is drawn, inside just a tiled wall in the shower, simple. It's an apartment in a multi-family about 120 years and the window faces another house, so it works.