citext, actually probably using extensions

I was pointed to the citext type to help solve an issue for a project I am
working on. I looked at this page:

https://nandovieira.com/using-insensitive-case-columns-in-postgresql-with-citext
But I must be doing something wrong. As the PG superuser, I did this:

postgres=# CREATE EXTENSION IF NOT EXISTS citext WITH SCHEMA public;
CREATE EXTENSION

and as the superuser it shows up in the \dx display

BUT as a normal user:

stan=> \dx
List of installed extensions
Name | Version | Schema | Description

---------+---------+------------+------------------------------
plpgsql | 1.0 | pg_catalog | PL/pgSQL procedural
language
(1 row)

It does not.

What am I doing incorrectly?

--
"They that would give up essential liberty for temporary safety deserve
neither liberty nor safety."
-- Benjamin Franklin