To use layers in modeler
If you would like to use layers in the modeler, first of all, you have to choose the layer tab from the right hand side.
Then, you need to click on the layer where a yellow light appears, as shown in the active layer. In modeler layer is one part of the software where you manage the parts of your model in a different layers.
The red circle in the picture: active layers
In layer you can use it as your guide to model your work. For example, when you load the sample model into modeler, the layer 1 will be activated. When you click on layer 2 the whole view will turn empty, but when you leave the layer 1 in half indicated, the model in it will appear as a ghost layer.
The red circle in the picture: Ghost Layers