It would be nice to have a standalone legend available as a tool in the Map Widget, separate from the layer list. Instant Apps have this behavior
Making the current option a "Combined Layer & Legend" toggle and adding layer and legend as separate options seems like the cleanest way to do this. If the combined toggle is on then you get the current menu but if it isn't the new toggles determine what buttons appear. 100% backwards compatibility without impeding the new feature, everyone wins!
You could build your own version with a Legend Widget and a Widget Controller. This should give you a good outline for the process.
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