Hey @wonderacademie,
Before I’ll show you how you can remove the empty h1, please note that have multiple h1s on a page is not detrimental to SEO if the HTML is properly structured. That info came from Google Webmasters which is an authority resource.
To change the H1 tag either to delete it or change it to h2, you first need to know how to override templates if our theme using a child theme. The full instruction can be read here: https://theme.co/docs/best-practices
Now knowing how to override theme templates, the template that you need is the _landmark-header.php which you can find in the \wp-content\themes\x\framework\legacy\cranium\headers\views\renew folder in your WordPress install.
Remember that you need to copy that file in the same folder structure in your child theme like themes\x-child\framework\legacy\cranium\headers\views\renew. Create folders if they don’t exist.
In the _landmark-header.php file, you’ll see h1 tags like what’s shown in the screenshot below. Change h1 to h2 or any HTML you need.

If the instruction is too technical, please hire a web developer and pass the instruction to him/her. That is because we do not handle support for template overrides or custom development in general. The maintenance of custom codes is also one you should take into account.
Hope that helps.