What to do with tall windows over fireplace?

use privacy film .

Tinted Window Film

You could try to custom order Venetian blinds with motor controls for the inside

Here is one site to look at, it's in Canada, but you can likely find something where you live http://welcome.budgetblinds.com/red-deer/motorized-blinds/?gclid=CjwKCAiA8vPUBRAyEiwA8F1oDFlMK0dD8u7hmJ_QDxFl-Kf_35IZFA9rBvh_yTPwWVFj1QW7X92BLBoC9nsQAvD_BwE

Where I worked until last year, we had clerestory windows all the way around the building. The sun was a problem until solar shades were installed on the lower windows and film on the uppers. It made a huge difference, but, didn't block the views of the mountains.

Hang a drapery rod over the windows and hang drapes. They can be opened and closed as needed.

I would go with some decorative window film, they have privacy, stained glass would be pretty.... https://www.amazon.com/s/ref=nb_sb_ss_i_4_22?url=search-alias%3Daps&field-keywords=decorative+window+film+stained+glass&sprefix=decorative+window+film%2Caps%2C241&crid=1KUJHRCQHXJJE

Window film.

Hi contact a film company . there are many different films for various purposes. They can Supply or supply and fit.