Click to show the objects on the layer. Click to hide
them.If an object is located on a layer with the visibility turned
off, and the object in the Structure tree is set to show visibility by
layer, the object is not visible in the Design window, and cannot be acted
on by the design tools. Layer visibility can be overridden in the Structure
tree.You cannot hide the active layer.Use Hide
Others on an inactive layer to make it active and hide the other
layers.You can make a hidden layer active which automatically makes
it visible.
to show the objects on the layer. Click 
to hide
them.