Worldeditor (Remove Walls, Invsible Object)

[Bosko]

I also noticed that the "Collision" is not activated when I start the Ep4 Juno Map in the Word Editor, the Ep1 Juno are activated and there you can delete the objects and run through again as far as I know without problems. Can someone tell me why it can be that I can no longer walk through things in the ep4 Juno that I remove, e.g. lamps, statues (decoration) in "Alt + E" there is nothing to be found so far.