Can someone please explain hierarchical crews and how do they work especially regarding tasks?

Hello I am trying to build my first hierarchical crew but I do not understand how task delegation works here. So we define bunch of tasks and manager decides who does tasks but what about order. Documents only say about hierarchical and sequential process i understand sequential but hierarchical only states “tasks follow smooth progression facilitated by manager’s oversight” does manager decides order or is it still sequential but dynamically assigned. Also crew gpt just flip flops on its answers for this.