Mute layers to temporarily hide them from the vertical edit. You can mute any layer except the topmost layer.
To mute a layer:
The identifiers of the muted layers turn yellow and the layers are removed from the output. In the following example, the output from L2 is muted, revealing the output from the next layer down—L1.
(a) Yellow identifier for muted layer (b) Layer hidden from output
Image courtesy of Quietman