Update App.js

public/Source/App.js

@@ -11,7 +11,10 @@
 		 animation: false,
 		 shadow: false,
 		 // // Set default basemap
-            imageryProvider : Cesium.ArcGisMapServerImageryProvider({url : 'https://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer'}),
+            imageryProvider : new Cesium.ArcGisMapServerImageryProvider({
+    url : 'https://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer',
+	enablePickFeatures: false,
+
 		 baseLayerPicker: true
 		 
      });