In general to know "Print Center" only shows visitors of your event (normally all users who started a registration).
In addition you can now also filter here, after:
- Role (InvitedSpeaker, Author, SessionChair...)
- Used voucher code (it you use voucher codes in your event)
- Custom query answers
In addition at the bottom you can select which template should be used (Default the normal template setting will be used)
Here to know that only visitors will be printed with another template when already they would be printed with the existing template setup.