I am guessing that you want to limit what a user sees when the login to the server and that is not functioning.
You are trying to setup Thruck and Livestatus which are not Nagios applications and you should go to their sites for more details help on the issue.
But, I did find some links that talks about the Visibility of Hosts and Services for Livestatus and the broker_module group_authorization setting.
https://mathias-kettner.com/cms_wato_us ... visibility
https://support.itrsgroup.com/hc/en-us/ ... ermissions
The loose settings for the group_authorization from what I found.
Loose group authorization means that an authenticated contact will gain access to view a host group, given that the user has permission to see at least one of the host group's host members.
Switching to Strict, the user only sees hosts and services which the user is a contact for), will only get to see a certain host group, in case the group solely consists of hosts which the user already has access to view.