How to use executeAs

I have an edge case where I need to impersonate another user in a workflow transition. The documentation refers to the executeAs feature (https://support.ptc.com/help/codebeamer/r3.3/en/#page/codebeamer/user_guide/ug_workflow_actions.html#wwID0ETBO1) and I have configured that in the application configuration and I even restarted the server but I don’t see that option showing up as an action or option. Where is this supposed to appear when configuring the workflow?