Layers
Layers are virtual levels in a drawing, analogous to acetate tabs (overlays) in traditional drafting. Layers enable you to sort objects in your drawing by type, by creation order, or by any criteria that suits the way you work. You can also use layers to protect certain objects from being edited or deleted.
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NOTE: Layers are not related to how objects are stacked in relation to their order of creation. If you change an object's layer, it does not affect its position in the object stack. |
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Layer 0 is the default layer, and all objects are placed here unless otherwise specified, or unless another layer is created and made active. Layer $CONSTRUCTION is created when construction geometry is created (see [Construction Geometry|https://docs.imsidesign.com/display/TC19UG/Construction+Geometry]). Neither of these default layers can be deleted, but you can change their properties.
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