There is no disable or hide options for Tenants. Deleting them would be the only way to remove them from view.
When you trigger a delete on a tenant a check is performed for any items (Accounts, Certificate, Deployment Targets etc) that tenant is linked to and a warning will be displayed listing any of these items.
e.g.
These links will need to be removed before the Tenant can be deleted.
When the tenant is deleted any audit entries (such as deployment history) will also be deleted.