Hello,
Thank you for your detailed explanation.
We understand the scenario you described. Unfortunately, this is not possible to achieve. The behavior is controlled by Joomla's built-in Access Control List (ACL) system. When a menu item or SP Page Builder page is assigned the Guest access level, any logged-in user is automatically denied access, and Joomla displays the access denied message.
Since this is Joomla's default ACL behavior, SP Page Builder does not have a setting or option to suppress or disable this message while the page remains restricted to Guest access.
Thank you for your understanding.