Similar to old UX, Hierarchical List of items within the page selector should be able to expand and collapse.
This feature in old UX is very handy when you have a lot of list items with multiple hierarchies.
In the NUX, it gets pretty difficult to select items when there are a significant number of list items you need to scroll through and you don't quite remember the name of the list item but you know which parent that list item is located. You would search for the parent list name but this doesn't help as search result only provides the searched list item.