setLayerVisibility
Sets the visibility for the specified layer name, for all layer types: Polyline, Polygon and Marker.
If the name of the layer exists in each type, all of the same name will change.
ex:
If you have 2 “default” layers one in polyline and one in marker, setting a layer name of “default” to false will hide both.
Parameters:
layerName(string): The name of the layer to updatevisible(boolean): Iftrue, then show the layer; iffalse, then hide the layer
Returns: Nothing
Throws: Error in the console if a layer is not found with a name that matches layerName.