Please port the Basemap Toggle Widget from the Javascript API into Experience Builder. For many public facing applications, two basemaps are enough. Most people just want to switch between a street map and a hybrid satellite map and the Basemap Toggle Widget is such a simple clean interface for this purpose. Yes, a builder could simulate this interface by adding two Maps to a Map Widget, but that is so much more work. And you could use only have the two options in the existing Basemap Gallery Widget, but that interface is much larger and more complex.
