In the SP Admin Console > Site > Settings tab there's an option to select the site sensitivity. This is separate from setting the default document label on a library. It notifies users if they upload a file with a label that doesn't match the site label.
I cannot locate documentation on what permissions are required to change this setting. In testing, Site Admins are not able to change their own site setting, they see a yellow alert bar stating they do not have required permissions to change this setting. A SharePoint Admin permission level was required.
Is there any documentation on this feature, what it does, and how to change it for Site Admins?