How to Remove a Field from a Form
Here is a code snippet that provides a general guide to removing fields from forms. See https://library.wpcode.com/snippet/r5pv1e58/
It lists the ‘hooks’ you should use for each form, as well as all of the fields that are included in those forms.
See https://library.wpcode.com/profile/wpcharitable/ for details on how to add a code snippet to your site with the WP Code plugin.
Let us know if you need a hand adapting that.