Administrators can manage access to the Juggernaut Firewall extension for customers under Juggernaut Firewall -> Settings -> Panel Application -> Permissions.
Denying access to a specific permission will hide that area for that user group.
If the administrator has granted access to an area then the user group will see a link to the extension when they login to Plesk.
The user group will be able to manage their geo-filtering policy for their domain to allow or deny access to it. See here for how to enable web server level geo-filtering in Juggernaut Firewall.