Sort color by option would be more relevant to bifurcate between Records with risk and no risk rather assigned/ release. May be worth to include color by " Flagged Records" which should cover both Epics and features in Gantt chart view.
Filters in Gantt chart - Do not have option to view flagged at feature level. That should be included and when Epic is selected for flaggged record only flagged features should appear rather all maybe. That would make more relevance why Epic is at risk and due to which features. Currently it becomes imperative to go to details at each feature .