Expand Tree to Selected Level
This example loads a fixed subsystem hierarchy into a left-to-right tree and lets the user switch the visible disclosure depth from a floating preset selector. It is a focused reference for using computed `node.lot.level` values with `updateNode()`, `doLayout()`, and viewport refit calls to reset expansion state across the whole graph.
Left-to-Right Tree with Preset Level Expansion
What This Example Builds
This example builds a read-only hierarchy viewer for a subsystem map. The graph opens as a left-to-right tree rooted at ALTXX, with curved labeled links and default rectangular nodes that keep the presentation close to the base relation-graph look.
Users can change the visible disclosure depth from a small floating selector, drag or minimize the helper window, open the shared canvas settings overlay, and download t