Overe organisations consists of 'sites' which can each contain an connection to a tenant.
To remove a tenant from a site, navigate to
'Manage Sites' ( In the bottom left of your screen )
-> Basic Settings
-> expand the three dots
-> Remove integration
Once the integration has been removed ( it can take a minute while the Overe App is uninstalled )
The Site can then be removed under 'Remove Site'
Once all sites, Site Members and Client App integrations have been removed, you can also remove the Organisation itself under Org.Config / Remove Organisation



