Just use <Ctrl+G> to find and go to any model element you are looking for. If you cannot find it in the list, then it has not generated.
I had the same problem but it seems that the newer verison of Mendix (I'm using 9.20.0) no longer generate or need this workflow.
I still got an error which halted my progress: The selected task page contains an outcome 'Complete task' that is not available on this 'User Task' activity. This was easily fixed by going to the new page you just created, clicking on the complete task button and under events change the outcome to the outcome you just created in your workflow.
Hope this helps.
I have added ‘Complete task’ in the outcomes and resolved.