Show Layers
Available when CAD format file is loaded. Press Show Layers 
button on the toolbar or select CAD Files -> Show Layers menu item for managing the list of layers. The list of layers appears in a separate window.
Press 
button for adding a new layer.
Press 
button for deleting the selected layer.
Press 
button to unfreeze all layers.
Press 
button to freeze all layers.
Press 
button to switch all layers on.
Press 
button to switch all layers off.
"Search for layer" edit box allows quick search of the necessary layer. Just click in it and enter the layer name.