You've recently removed the CloudSOC integration from WSS, and aren't sure how to remove the Data Source from the CloudSOC web UI.
CloudSOC does not allow customers to remove the WSS Data Source from the web UI.
CloudSOC Web UI
Audit Data Source
Create a support case to request help from a support engineer to perform this action.
Support will need to unlink WSS from a back-end tool in order for the Data Source to be removed.