Fundamentals > Working with the Model > Layers > Layer Basics > To Activate a Layer
  
To Activate a Layer
You can control the layer on which drawing items are placed by setting the layer as active. After the layer is activated, any drawing items created, shown, or pasted in the drawing are placed on the layer. If a layer is activated in a 3D model, all the newly created 3D elements are added to this layer.
A layer remains active for the duration of the session until you deactivate it, change to another layer, or end the session.
If you manually create a layer, you must manually activate it. You can manually activate a layer by doing the following:
1. On the Model Tree, click and then click Layer Tree. Any existing layers are listed.
2. Right-click the layer that you want to activate and click Activate. appears next to the activated layer. Any drawing items created, shown, or pasted in the drawing are placed on the active layer. The following table lists different states of the default and nested layers.
Default Layers
Nested Layers
 
Default layer is activated
Nested layer is activated
Default layer is isolated and activated
Nested layer with hidden components is activated
Default layer with hidden components is activated
Nested layer is isolated and activated
 
You can automatically activate a default layer by creating it with the def_layer configuration option. If you set the def_layer configuration option to layer_all_detail_items, you can activate 2D elements. To activate 3D elements, set the def_layer configuration option to layer_3d_items.
If an active layer exists and you activate another layer, then the first active layer is deactivated.
If you activate a layer that has the same name as another layer, then each layer with that name is activated.
If the top-level drawing layer is Layer X and the part layer is also Layer X, then activating Layer X in the drawing activates Layer X in the part. However, Layer X in the drawing contains all detail items while Layer X in the part contains all 3D entities.
If you open a new model or drawing in the current Creo Parametric session, then no layer is active for that new model or drawing.
If Drawing A has an active layer and you open Drawing B, then no layer is active in Drawing B. However, if you switch back to Drawing A, then the active layer is still displayed.
If you open a model in a new window, then no layer is active for that model.
If you switch to a model that did not have an active layer, then no layer is active for that model.
Creo Parametric remembers the active layer status for the top-level model layer and any existing same name layers of submodels and retains the status in the active window. However, if you open a submodel in a new window, then no layer is active for that submodel.
If a submodel does not have a same name layer as that of the top-level model layer that is active, a new layer is created but not activated. The submodel does not have an active layer.