Currently, in the project backlog screen all parent tasks and subtasks are mixed together and it is not easy to differentiate between them. Whilst you can show parent task this is not recursive ie you only see the immediate parent task name.
I would like a tree view feature so that you can see the true hierarchy and move some or all subtasks depending on what node/s are selected. This would make it easier to organise the Kanban board. I have not looked at Agile Sprints but maybe the same logic applies.