Layers > Undo (Manage Menu)

This command reverses the last command that changed the layer attributes. It will work for changes made by means of one of the following commands residing in the "Layer Management" submenu or within the layers dialog.

Only changes made to the layer attributes "Display", "Output", "Lock", "Ignore" and "Shade Down" will be reversed. Changes to the transmission of layer properties, as well as creation, deletion and renaming of layers will not be influenced!