Hi.
I'm not sure if this is a tricky question (or a typo) in a feedback I received about PO topic, but I think it may worth the discussion:
What is the PO role in managing the Sprint Backlog?
It is stated in the Scrum Guide that the PO is responsible of the Product Backlog and describe a list of tasks related to Product Backlog management. Therefore, there's nothing the PO does to manage the Sprint Backlog.