I would like to be able to delete data sources. I was having a problem with my data sources so I added it three times. Now I can't delete it but they are all called exactly the same thing, which is annoying.
Map Layers widget:
Remove the "bookmarks" layer from this widget when bookmarks are enabled. The bookmarks layer is not visible in the webmap, so I don't know why it is showing up here. It doesn't seem to do anything when users turn it on or off. Plus, I have a separate widget to manage the bookmarks, so it is not helpful here.