Kanban View is not showing other than 1st Level tasks - is there a way to set this to show all levels?

Kanban View is not showing other than 1st Level tasks - is there a way to set this to show all levels?

Our manager has created complex task lists with multiple levels.

As a result, most of the Tasks are not showing in the kanban view.  Only the top level task in each list.

How can we have Kanban view show all of the levels - so we can manage individual tasks?