I was working through the tutorial and was in the Create New Document section.
I clicked on "@ Mention" in the lower right under the text window, wondering what it did.
It put an @ in my document and gave me a popup list of names to choose.
Hmmm. OK, so that's what it does.
I clicked in the Document window and the popup went away. The @, however, remained.
If I click "@ Mention" again, there is no popup. It just keeps adding another @ to the string.
Retrieving data ...