Show Layers
Available when CAD format file is loaded. Press Show Layers 
button on the toolbar or select [CAD Files > Show Layers] menu command for managing with the list of layers. The list of layers appears in a separate window.
Press 
button for adding new layer.
Press 
button for deleting selected layer.
Press 
button for all layers to be unfrozen.
Press 
button for all layers to be switched on.
Edit box with the grey lighted line "Search for layers" allows quick search of necessary layer. Just click left mouse button inside and enter necessary layer name.