Currently subtasks are not distinguished from regular tasks when we are in the list view. While parents tasks have an attached icon declaring that the item has subtasks, the subtasks look exactly like regular tasks unless we specifically click on the task to verify if it has a parent task.
Our first recommendation is to label all parent tasks and subtasks. In this example, the task labeled P would be the parent task. The tasks labeled S1 are direct subtasks of P. S2 would be the subtask of S1 (sub subtask).
It would be useful to have the ability to click on the parent task/subtask icon and have all its dependencies (both parent task and subtasks) highlighted. This would be especially useful for when you have sorted your list view by due date, creation date, etc.
(The highlighted items are all dependencies of one another.)