https://support.esri.com/es-es/bug/the-layer-list-widget-in-web-appbuilder-for-arcgis-deve-bug-000093983
BUG-000093983 for ArcGIS Web AppBuilder developer edition
The Layer List widget in Web AppBuilder for ArcGIS (Developer Edition) does not behave correctly when a map service with multiple nested sublayers is added...
arcgis web appbuilderdeveloper editionbug
https://www.esribelux.com/nl-be/products/arcgis-web-appbuilder/resources
ArcGIS Web AppBuilder Resources | Tutorials, Documentation, Videos & More
Explore ArcGIS Web AppBuilder resources such as tutorials, documentation, and videos. Find answers, build expertise, and connect with the community.
arcgis web appbuilderresourcestutorialsdocumentationvideos