To mute or unmute channels in the Dope Sheet or Graph Editor
In the Graph Editor or Dope Sheet, Mute appears under the current animation channel’s name in the outliner and a Mute curve or channel appears in the view area.
The muted animation curve now appears as a dotted line in the graph view.
The current animation curve’s Mute node is deleted, and all occurrences of Mute are removed from the Graph Editor’s and Dope Sheet’s outliners and views.