Add Layer List Element to Dashboards

[LaurenWinkler]

Now that we have Exclusive Visibility (radio buttons) for grouped layers, users should be able to easily toggle between layers in a dashboard.

There is a map legend dashboard element, but without a similar layer list element, it takes 3 clicks for users to switch layers:

1. Turn on the layer list (because it cannot be opened by default)
2. Expand the layer group
3. Select a layer

Dashboards are intended to be used by the public, and the steps to choose a layer are not clear to users who don't regularly work with the ArcGIS Online Map Viewer.

This is based on the forum post and idea suggested by @KrystalPhaneuf3. Esri closed the idea in October 2022 and asked that it be resubmitted for consideration. 

[StevenDel_Castillo]

Hi

I've found a workaround solution to make it easy for users to turn layers off and on by simply clicking a button. Perhaps this will help with your inquiry. See screenshots below.

This works since there is never a "0" objectID, which becomes my OFF button. ON is basically everything else non-zero. 

Steven