To clarify, the wall-like gray panels are thin verticle planes, not flat horizontal like a floor or ceiling.
Puybaret, thank you much. I will try your suggestion, but it seems more like an alignment issue. Can I shut this tool off?

Hi Everyone,especially experts.
I have grey panels that seem to be be some kind of alighnment panels or flat wall-like markers. How do I get rid of the, turn them off, or learn to use them accurately. Please help, I'm spending way too much time trying to figure this out.
Thanks to all who reply....

Ok, thanks much,you guys are reaaly great, I appreciate all the help.
So, how about this question; let's say I have a 5m x 5m floor (kitchen) which is adjacent to a terrace that is 5m x 5m. I want to lower half the floor area of the kitchen along with half the area of the terrace. In other words ...

Thanks! Also, how do I merge 3 or 4 levels into one level? I want to have a consolidated plan view of my structure, but right now there are 4 levels that I want visible as a plan view.

I have 11 levels, my first effort, for a two story house.How do I combine some layers to create a full plan view? How do I combine all layers for a total 3d view also?