It is not expected to run this activity manually. This will only get executed when you use an agent to run this activity. You can schedule an agent to run the activity as per your business requirement i.e., once every week or so. There is an OOTB agent Pega-RulesEngine which includes the agent schedule “DisableDormantOperators”. Please find the screenshot below for reference.
@Anupam Dubey We are on Pega 8.7.4 and DisableDormantOperators agent is not enabled OOTB. What could be the rationale for disabling it OOTB. Does Pega provided an alternative to this agent?