On the editor, the UserWidget hierarchy panel, “named slot” widget order does not reflect their actual widget tree hierarchy. They seem to be ordered top to bottom first to last created. This gets very confusing where named slots are used a lot to build reusable layouts, as a slot named “header” expected to be at the top is displayed ordered in another location. Not only that, because the order is wrong you can’t easily read at which “depth” (aka Z-Index for web devs) the widget is at. Widgets added after another on the hierarchy will always render on top. I fully depend on the hierarchy to control this since manually writing z-indexes with the “add to viewport” node is just fragile.