"Collapse All" and "Expand All" for hierarchically nested entities in list view

I have a generic entity type ‘page’ that is used a lot, and relates to itself through a field ‘parent page’.
In a list view, this is displayed through collapsable and expandable rows.

Over time, such list display becomes complex and opening closing parts of the hierarchy is tedious and gives massive cognitive overload.

Solution: add a button to Collapse all / expand all hierarchically related entities in the view.

Please, please, please add this!

Due to a bunch of recent feedback I’ve gotten from our teams (we just rolled out Fibery officially this week), they want to see things in the list view nested at a pretty deep level (6 levels deep in some cases) and everyone continues to say “I can’t believe there’s no option to quickly expand or collapse all the levels”