This topic assumes you have already added a layer.
In the Layers panel, click on a layer name to select it.
Click Activate Layer. You can only add entities to a layer that you have made active.
Use the most appropriate method and tools to create entities. Any newly created entity will now reside in the layer you made active. You can also assign existing entities to the active layer.
Tip: You can also edit the display attributes of a layer.