Hello Rainer,
Thanks for the wonderful contribution!
I installed the Header Tags SEO add on Ver5.2 and activated the header tags for a few pages that do not have an equivalent in the classic store, ex about.php. When I checked Admin > Header Tags SEO > page control, these pages are not listed. They were not excluded in /catalog/admin/includes/functions/header_tags.php so I am not sure what I need to do to have these pages to show in Admin so I can change the default header tags. I double checked the install instructions but have come up with the same result.
What do I need to do to have this pages listed?
Best regards,
Joe