Group by parent task

I use list view to have a quick overview. Parent Task and Subtasks are always displayed as

Parent Tasks > Subtasks

Sometimes this is very difficult to read.
A button in the filters would be great to group by parents.


Maybe this could be a solution to the problem described here:

Yes I think so. I think most users will have not that much subtasks.

And with a big screen it is not a problem just on mobile views.