Found the answer by exploring the UI:
Even if the Epic issue is "DONE", it will show up in the Epics panel. To mark as done and remove from Epics panel in Backlog, you have to go to the Epic and there's a dropdown next to the name of the Epic to "Mark as Done":
...PermissionsStartOnly=true User=www-data Group=www-data ExecStart=/opt/jira/bin/startup.sh ExecStop=/opt/jira/bin/shutdown.sh TimeoutStartSec=120 TimeoutStopSec=600 PrivateTmp=true [Install] WantedBy...
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