How to join strokes points / closes the figure using grease pencil Is it possible to join two grease pencil stroke points to continue and complete the figure ? (something like E and F between vertices) ?. I created a short video to show you what happens when I try to do it. Thanks.

https://sendvid.com/xk5nfttx
You can join Grease Pencil points by selecting two points and hitting CTRL+J, does it work for you?
If I want to do something but don't know whether such feature exists, I often use Spacebar and write down a term that could describe it... in this case I just wrote "Join" and this function with the shortcut appeared in the list.