Don't show completed tasks on the source calendar (toggle option)

I would like to see an option to delete tasks that were scheduled and have since been checked as complete.

I have the option to hide them on the Morgen calendar by unselecting the "Show completed tasks" option. That is not enough because the tasks are just hidden from view and are still visible in my Fastmail calendar. When a task is done, I do not want to see it again.

A variation on this would be an option to purge all completed scheduled tasks after a set time. So, for example, those tasks will automatically get deleted 24 hours after they were checked as complete.

I'm new to Morgen, so I apologize if this request is for something I just haven't discovered is already available.