In case the Control Rule defined on the Design Code set on the Root Object is “QAC A”, the “Review by Approval Group” workflow activity is mandatory, and the system automatically suggests you the Approval Group to use. However, you can decide to assign this workflow activity to another Approval Group defined in the PLM.

For selecting/changing the Approval Group, you need to access the “Approval Group” tab from the Design Verification workflow profile card and select the following icon:  that appears after you have clicked in the field:

Complete documentation: Design Verification Workflow FAQ