Get a glass company to order a sheet of tempered obscure glass and mount it inside the new window with stops.

https://www.decorativefilm.com/solyx-sxwf-wm-white-matte-12-24-36-48-60-or-72wide?gclid=Cj0KCQiAy579BRCPARIsAB6QoIYtDC4auvrGJxAw4GqxGr_dBAU-52sJiIvT5OrCjM6xackrL_2QkkMaAm_gEALw_wcB

Thanks for the suggestions! Thanks for sending me to exactly where I needed to go Jennifer! We'll try that and go from there if needed!

The window you ordered is Tempered Glass correct? As long as it is I would be what Hallett suggested.

Beware that advertisement for window films and other products can be deceiving about what they block. What ever you choose, be sure to check "the view" from the outside when the lights are own inside and it is cloudy or dark outside. A lot of things work OK when the sun is shining but they don't work so good at night. Even just a body outline can be unacceptable. A few years ago a new young couple bought the house next door and chose white shades for their bathroom window that has a floor to ceiling window across from the toilet. Also, between the toilet and the full window was the exit from the shower so that same area was where the after shower dry off took place. I never saw it but the neighbor across the street from the young couple got a couple of shocking views and was nice enough to take the young wife aside and share the problem. The peep shows ended that afternoon.

Damn nosey neighbors have to ruin everything.

I have a similar window in front of my tub and shower that has a beautiful mountain view, so I'm putting in top down/bottom up shades that I can control remotely.

3M makes window film that they come and adhere. You can get it in all different amounts of obscurity. We did that for several doors and for the windows in our garage

Pro already said top down/ bottom up - inside mount in blackout could do it... and easy to wash light weight over it... size at 5 x 5 idk..