Has anyone done this? Because this feature is 100% needed.
Also: Shift-Click a folder’s Collapse / Expand arrow does nothing - the expectation is that the folder and all children should uniformly Collapse / Expand.
Example: Open a level, all folders are expanded. Shift-click on the World ‘arrow’ to collapse everything, then normal-click on the World ‘arrow’ to find all folders are in an collapsed state.
Edit: The Content Browser works in this way … odd that the World Outliner does not.