I can’t find the rectangle shape for Value Chain collapsed processes.
Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.
To change the “Process” or "Collapsed Process" in Value Chain diagrams into a “rectangle”, you have to use the attribute "Orientation" in the section "Main attributes", and select the option “Rectangle” in the list.
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KBA , BPI-SIG-PM-ONP-SOL , Solr for SAP Signavio Process Manager , How To