Hello @DanaL03. Thanks for coming into the Community! There are a few edits that can be done to the footer of your emails like your business' physical address or name, however, you are not able to edit the text size or styling. I do have some information that I would like to send over to you about editing the footer so I will send this over to the contact email on your account.
Thank you for reaching out with your feedback on this process. These footers are not a standard editable area in your email since they display the same across all campaigns. With that being said, the font size is not the only thing we can change. There's so much more than can do if you take advantage of the service!