Honestly, that doesn’t feel very discoverable to me… is that intentional? I can imagine that you really want the community to “live” on the observable site itself, but then it would also be nice if it had more forum-like discussion features than it has now.
Now the link is under ‘Learn’ along with Tutorials and Documentation, while the next link is ‘Community’ which doesn’t have a popover but is clickable.
I always expect to find Forum under Community and sometimes keep clicking on it accidently
While we are here, having ‘explore’ and ‘learn’ be unclickable mouse-over menus while ‘community’ is a clickable link with no menu is slightly confusing, since all 3 look the same.
a10k: Once you get to the community page there is a link to the forum at the bottom.