Comment Order : Want Descending by Newest

I’d like my comments to be displayed in descending order by date.

I went to Settings -> Discussion and found this:

Comments should be displayed with the “oldest or newest” comments at the top of each page.

I changed it from “oldest” to “newest” and nothing changed. The comments are still in order of “oldest”. Am I not understanding what this setting is supposed to change?

Jill