I am using ArcGIS API for JavaScript 4.10 for a map with a Search widget and I want to use it to match locations only from a private featureLayer. I have set this featureLayer in sources property of the Search widget and it appears and works, but there is also another search layer here called "ArcGIS World Grocoding". How can I remove/disable this default feature so that my Search widged works with only my data?