@dickiesmudge,
It def. seems like we simply need to add some custom CSS specific to your theme to prevent the header/footer from displaying. Like I said we try to guess at this but we have no way of guaranteeing that our guesses are going to work with the structure of every theme out there.
I don’t have a copy of the theme so I’m making some guesses based of the theme demo I found when googling OMNITHEME. I won’t buy premium themes for support requests (I think you can understand why) so hopefully this will work:
.single-llms_certificate #banner-section,
.single-llms_my_certificate #banner-section,
.single-llms_certificate #footer,
.single-llms_my_certificate #footer {
display: none;
}
You can add that via the customizer: https://lifterlms.com/docs/add-custom-css-using-wordpress-customizer/
If that doesn’t work and you’re a LifterLMS customer with access to email support please submit a support ticket so we can help you out further.
If you are not, I’d recommend contacting your theme developers and ask them how to HIDE the site header in the print view of LifterLMS Certificates (the post types are llms_certificate and llms_my_certificate). They should be able to use that information to provide you with the CSS that matches their structure.
Hope that helps!