How to customize the fields on the individual leads page?

How to customize the fields on the individual leads page?

How to customize the fields on the individual leads page?
At the top, it usually says the leads company, name, then lead source, email, phone, lead status etc.
and then, I can click on a switch below it which expands and offers more information.


But I would like to put a field in the TOP part, so that I can see it right away, and not have it in the BOTTOM part.

Any ideas?