Updated:
Support contacted me and notified me there was an issue with the third party Elementor editor. They released an update and I was able to finally get the header to render properly.

Not ideal to have to go through a lot of fuss just to get it to work, but I do like the theme design and I am happy that the customer support team promptly fixed the issue.

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Header renders white background in mobile screen size. I just now launched a fresh instance (server) and downloaded and installed the latest version. EXACT same problem. I switch my browser to mobile view, and white header with no text visible.

I will open a ticket and send a link so author can see it.