Is there a way to see the words we have marked as known? I haven’t noticed such a feature.
Nope. You can look up words you’ve lingqed and then moved to known via the vocab page. But for the ones you’ve marked as known from the beginning there isn’t an accessible list.
There should be one.
I’m sure I’d find a use for such a feature. It will have to be cleverly organized, though. When I get a-lingqing, I can add 3000 known words a day. I expect to have upwards of 60,000 words eventually.