That settings screenshot looks like the Custom Header Links - #84 by TheBaby5 component, which is for showing text links not icons.
I can see how the components are named in a confusing way:
-
https://github.com/discourse/discourse-header-links- icon links (this topic) -
https://github.com/discourse/discourse-custom-header-links- text links (Custom Header Links)
Maybe you should add icon to this one’s name @Johani?