Enhancement Request: allow customizing which layers are expanded by default from the WAB graphical user interface in the Layer List widget configuration, on a per layer basis. Along with other interface enhancements (i.e. Allow sublayer to turn on parent(s), when turned on? true/false; partial checkboxes, and others) Also a 'turn on this layer only' button like Flights on Google Flights, Skip Lagged, Kayak.com etc where you can select one airline, exclusively, by clicking the word 'Only' next to an airline, and the others turn off.
