Delete parent job

We have just upgraded to NBU 7.6.1.1 and noticed the hierarchy display in the activity monitor, very cool. We like to keep a few days worth of the jobs completed in the display. We have noticed that if there is an error on one of the children and after a successful rerun, we like to clean up our activity monitor, but when we delete a paren job, it also deletes all of the children, successful or not. Is there a way to configure this so we can keep successful jobs in the activity monitor, but delete the errored parent?