In version 0.7.0-beta of the Exchange extension, the orderbook is available even for non-logged-in users. Please see the full release notes here: https://www.dashed-slug.net/static-exchange-templates/
I reply to all queries on the forums and via email, once per day, Monday to Friday (not weekends).
If you are new here, please see some information on how to ask for support. Thank you!