Questions about syncing Hub Site with Associated Sites

Jean5288 The hub visitors group is "additive" to the associated sites - it effectively adds an additional permission group to the site - Visitors, Members, Owners + Hub Visitors. Not all associated sites need to "accept" the additional hub visitors group. You can have some associates sites that use it and others that do not. You probably don't want to remove the members of the Visitors group from associated sites because if you remove that site from the hub, there will be no Visitors on the site. In other words, since Hub Visitors are added the ADD readers to the associated sites. If those sites leave the hub, the additional visitors lose their access and only the "local" visitors for the site have access. If your goal is to share read permissions for multiple sites, you may want to use an Active Directory Group, which can be added to any of the SharePoint Groups in more than one SharePoint site. Learn more: https://support.microsoft.com/en-us/office/set-up-your-sharepoint-hub-site-e2daed64-658c-4462-aeaf-7d1a92eba098#bkmk_managesiteassociationapprovals.