From theMap Layers editor, from the Layers menu, click Remove Map Layer.
The Remove Map Layers from Watersheddialog (Figure 1) will open. Select the map layer to remove from the watershed, click Remove. A warning window will display asking you if you really want to remove the selected map layer, click Yes.
The Remove Map Layers from Watersheddialog (Figure 1) will close, and the selected map layer will no longer display in the Map Layers editor.