Firstly, Experience Builder doesn't yet support having more that 1 layer list associated with a web map. It would be helpful to have this functionality, so that a user can thematically group the web map's layers into separate layer lists, in the same way that can be done in WAB (by unchecking the layers that you don't want to be in each layer list).
Secondly, for both WAB and EB, it would be very useful if you could shift/ctrl select a number of layers during widget configuration, and then batch turn off their visibility. Or have a button to switch all layers off.
Example, i have ~200 layer in a web map. I have grouped them into 5 layer lists, in order to make it easier for a user to locate them (solves the issue of grouping layers in WAB too). However, whenever you add a new layer list to a web app, all the layers are included, and you have to individually exclude them from the layer list widget, which takes forever:
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