To run the project with streaming enabled and release optimisations, run LevelStreamingPlayer.
To manage levels and their assets, run AssetManager, or to edit level layouts and content, run LevelStreamingEditor.
The demo scenes are quite overkill on how quickly they cull out zones, just to demo the system in action in such a small environment. Feel free to create your own levels, or adjust the zone sizes in the demo scenes using the editor!