LAYLCK command
Locks the layer of a selected entity.

Icon:
Description
Lock the layer of a selected entity to prevent entities on that layer from being edited.
Method
Select an entity on the layer you want to lock.
The Command line indicates which layers have been locked:
- This layer has been locked: LayerName1
- This layer has been locked: LayerName2
Entities on locked layers are faded by default. You can change layer fading with the LAYLOCKFADECTL system variable.