When working with large scenes in CityEngine, it is often useful to hide objects temporarily to declutter the scene. Open the Visibility settings 
and click Isolate Selection or press I in the Viewport window 
.
Select the object to isolate and click Isolate Selection (I) to remove all other models in the scene. Modify the isolated objects. You can also change the selection.
Click Isolate Selection (I) again to reveal all (according to visibility settings in the Scene Editor window 
) models in the scene.
