You are trying to verify the DLP "External Appliance" or "Enforce Managed DLP" settings in the CloudSOC but it's not where you remember from before.
Updates to the UI changed this slightly. See screenshot.
When logged in to the CloudSOC UI, click on the "gear" icon in the upper right, then look in the leftmost sidebar for "Settings > Symantec DLP"
From this view one can manage the Detector as listed, including de-activation and removal.