The layer list widget in WAB is problematic. End users often struggle to figure out how to use it. My organization has a public facing map viewer with numerous layers grouped into several themes and we configure the layer list to be collapsed by default. The most common problem is that end users dont understand that they can expand the top level group and see the sub-layers to turn on. A secondary probelm is that they turn on a sub-layer while leavng the parent layer un-checked and conclude that the app is not working correctly.
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