IDM work-list may contain many hundreds of work items.
This means that the OOTB setting of 100 is far too little since the approvers will then not be able to see the complete work-list.
Increase of this setting is described in Knowledge Document:
However, the config user doesn't have write access to file /opt/CA/wildfly-idm/standalone/deployments/iam_im.ear/workflow.rar/META-INF/ra.xml when running on the Virtual Appliance.
This was recreated and isolated as a defect in Virtual Appliance. The root user has been given access through a hotfix.
Please contact support if you need this hotfix. Thank you.