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Ground elevation was by default turned off for me, but via the burger menu and then "Graphic options" I could turn it on.

Yeah, they definitely need better UX

Neither was I, thought it was a location based thing, like maybe it only works in the USA, so tried SF. Nothing.

Maybe the UX needs work to make it obvious how to get 3D?

I just zoomed and the 3d effects was activated. What browser are you using ?

I tried Chromium and Firefox.. it usually looks like this: https://i.imgur.com/9m2wExo.png ... maybe they are overloaded