How can I cover the window on the door for privacy?

You can use film made for glass for privacy, or use frosted contact paper in a pattern, or even paint it with glue/acrylic paints. Here are a few ideas you could adapt easily:

https://www.hometalk.com/diy/windows-doors/windows/stain-glass-with-glue-and-acrylic-paints-43294903

https://www.hometalk.com/diy/windows-doors/windows/ez-stain-glass-windows-39287626

https://www.hometalk.com/diy/windows-doors/windows/s-10-refreshing-ways-to-avoid-the-see-through-in-your-glass-32068727

I use non-adhesive window film, I got a leaf pattern one one Amazon who has hundreds of patterns to fit everyone's taste.... https://www.amazon.com/s?k=privacy+window+film&ref=nb_sb_noss_1 you just apply it with water, a bit of soap, and a rubber squeegee. Literally takes minutes to apply. The measuring takes more time than the application. Use a really sharp single edge razor blade to trim.

Hi Pat,

You've received some fun ideas. I wanted to point out that if you like the curtained look, you can make your own. Make it double the width of the window with pockets on the top and bottom for a rod to hold it tight. Get some curtain brackets and a piece of PVC pipe in a small size to fit. Load the curtains on the rod, put the brackets where they fit and you've got what you need. You might even be able to use Command hooks - I'm not sure about that, but you can check it out. You could make it with any fabric that YOU like, from lace to velvet. ;0 Wishing you the best.

Thank you for the great ideas!