Getting Started with the Map Viewer : Using the map viewer : Using the Layer Manager : Showing and hiding all layers
  
Showing and hiding all layers
1. Open the Layers Manager by selecting the Map Content and Legend button in the command bar.
2. If required, select the Layers tab in the Layer Manager.
3. Select the map service listed in the layers view. The Layer Manager displays the current active layers.
4. Select next to the map service, and from the menu that appears, select Show All Layers or Hide All Layers to either show or hide all layers on the map.