How to hide data sources from the Diagnostic Dashboard
An administrator can choose which data sources will be displayed in the Diagnostic Dashboard's charts: "Number of Unique Customers Identified Across x Sources" and "Number of Customers Identified Per Source".
It is possible in the Administration tab/ Sources & Destinations tab in the column "Show in Diagnostic Dashboard".
Changes will be seen after the closest cache refresh. In order to see the changes as soon as possible, an administrator should refresh cache manually in the Administration tab/ Settings tab.