I can’t -—I wasn’t even aware that Kindle Unlimited existed-——the free books I download don’t require “Unlimited” as this link will show.
https://www.amazon.com/No-Good-Deed-Psychological-ebook/dp/B003PPDB8K?_bbid=8406533&_bbtype=email
I learned something today———and sorry for the confusion.
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OTOH, I see that my Amazon Prime acct has a feature called "Prime Reads" that has a *selection* of free books (incl one each Harry Potter & Lord of the Rings, two John Grisham kid's books, various SciFi & Murder Mysteries, ...), and free magazines (mostly women's mags, but also Natl Geo, Readers Digest, a few gun mags, etc.)