For many self-publishers, this is something they either ignore, or don’t do well. Unfortunately for anyone in the industry but also educated readers, this is an immediate sign that you aren’t professional. Being a self-published author still means you need to adhere to what industry standards are, as well as reader expectation.
This article is a great checklist for you. If you’re not sure how to format a Copyright page, simply look at one of your favourite author’s page. Try and get yours looking as close to that as possible. (Even putting your own publishing company as Publisher, instead of just your own name).