A blue "filter" icon is displayed In the SafeGuard Enterprise Management Center.
Known to apply to the following Sophos product(s) and version(s)
SafeGuard Management Center
All supported versions.
What To Do
The SafeGuard Enterprise Management Center is, by default, configured to display only 1000 objects per container.
To indicate that a filter was applied to a container (e.g. a Organizational Unit) the "blue filter" symbol is added to the icon (see screenshot below).