There is the information that the administrator can set the activities list in the diagram page of Collaboration Hub as invisible but when I, the administrator, check the visibility settings in the Collaboration Hub, I cannot see where I can make it invisible.
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In the Collaboration Hubs settings, navigate to the 'BPMN Diagram' page under 'Page properties'.
Uncheck the 'show on page' checkbox in 'Activity List' to make the activities list invisible in the Collaboration Hub.
KBA , BPI-SIG-HUB , SAP Signavio Process Collaboration Hub , How To
SAP Process Collaboration Hub by Signavio all versions