100% AGREE. Especially, when turning on hierarchy filters, seeing lower level list items in the drop down only clouds the view (since when selected, it syncs to the parent level and displays all the sibling items). If the page selector dropdown opens as collapsed and can be expanded on demand, users will only see the set of list items they want to see without scrolling through. Search is helpful but in the case of numbered lists, when there are list items with the same display name under different parents, the search is confusing as it won't show which list item belongs to which parent.
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