Yeeees, it would make more sense to create the outside walls, group them and put them on a layer, called perhaps, Outside walls. Then do the same with inside walls and so on. And yes, when you open to edit you are working on layer 0.
Don’t change the active layer. The radio button next to the layer, always leave it on Layer 0. One thing to note, if you explode a group, unfortunately the exploded geometry inherits the groups layer, so keep an eye on that.
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