Layer Management > Light Up (Manage Menu)

This command can be used to light up layers by identifying objects that are assigned to the desired layers. To light up a layer means to clear the attribute "Shade Down", i.e. the layer will be displayed in its original color(s) again.

Choose the objects whose assigned layers are to be altered. Click on objects to choose them, including objects in locked layers.

After identifying the objects, their layer assignment is determined and all affected layers are lit up.