Hi @bluegoldycc,
For solving the issue, you can create a child theme. You can take a reference on how to make a child theme from the following link.
https://themegrill.com/blog/tutorial-creating-wordpress-child-theme/
After creating a child theme, create a new header.php file in the child theme. Copy the content from the parent header file and paste it in the child header file. After that, remove the hide
class from the site-navigation
. Finally, add the code mentioned below in the Appearance > Customize > Additional CSS box.
#category-navigation{
display: none;
}
Thanks.