How to hide standard form field?

I found a couple of fields which not required in my case in Customer create form.
Those fields may confuse our users as a result, I’d like to hide those fields. Is it possible?

Customize form - open that field - hidden

This does not work when I do it on a help article.
It still shows on my website, please help.

This is also a problem for me. Fields marked with hidden are not hidden.