Martin Visarraga,
do you mean, that the legend shows only the layers visible in the current map extent (and not map scale/zoom level as it is for now)? This would be highly useful for me too.
Is there a way to implement this in WAB (non dev?). Any hints highly appreciated.
My use case is that I have an app with several land use plans in different areas. When I zoom into one area, all the other plans do also show up in the legend, even if they have nothing to do with the current (geographical) map extent. This is very confusing and user-unfriendly.
Probably there is need for an ArcGIS Idea...
legend widget, #wab 2.2 , #arcgis online web appbuilder