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Refrain from editing core files WordPress was developed with extensibility in mind, and provides many ways to change the appearance and functionality of an installation without altering the WordPress software itself (mostly using Hooks in conjunction with Plugins and Themes). The software is comprised of it's "core files", which are generally ...
Did you try to visit your site as an anonymous user, because the field "display name publicly as" should work in comment sections too. Try opening a "private navigation" window from your favorite browser and check.
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