Some things that would be nice to see within the Layers:
expand the layers and a better visible structure, I mean the triangles, should be not in the same layer like the top level triangles, that’s a bit confusing in combination, that you can’t expand the names to see the full names of the layers. But anyway the layers are a big step forward 
It would also be nice, that it’s possible to "switch on or off elements or a complete layer. That means if one element is switched of in the layer it’s not visible on any site, but should not replace the setting on the right side where you can show / hide an element from an Device.
