The Lighting Controller

I don't see in 6.00 how to delete an unwanted or junk Scene directly from Editor like the Builder in 5.21.
I know how to go into the file system and do it manually but it would be convenient to be able to do right from the Editor.

Yes, this feature is missing in version 6.00. It will be added in next version.
In the meantime, you can go in "home_directory/TheLightingController/LightShows/YourShow/scenes/", and remove the scene (YourScene.SCE) file manually.
Just watch the scene is not open in Editor or Live, when your remove it.