In a web map application (particularly those created using the app builder) in ArcGIS Online, it would be useful to have an additional option in the pull-down menu in the Layers List widget to enable the end user to turn on/off labels.
This would be helpful. It's a pain to only be able to turn ALL labels off or on when using the print widget in web app builder. It would be nice to be able to turn them on or off in the layers list like you can in web maps.