If I open more than one tab with a document, it would be nice to be able to open different notes in each of them, so that, for instance, each tab would have a separate note.

Thanks for creating a new discussion. I'll be creating new discussions for new feature requests.

What I mean here is this:

Suppose,
1) I am reading Document 1 and I create Note 1, linked with Document 1.
2) I reading Document 2 and I create Note 2, linked with Document 2.

What I want is to be able to:
1) Open Tab 1 with Document 1 and to open Note 1 on the side;
AND
2) Open Tab 2 with Document 2 and Note 2.

I want to be able to do 1) and 2) at the same time. In other words, I want to be able to quickly check Document 1 and Note 1 AND Document 2 and Note 2.

Does this make sense?

I am referring to child notes.

Now, I open Doc 1 and its child Note 1 in Tab 1;
I open Doc 2 in Tab 2;
and I see child Note 1 in both tabs.

If I open Doc 1 and its child Note 1 in Tab 1
and Doc 2 and its child Note 2 in Tab 2,
Note 2 is what I see in Tab 1 and Tab 2,
even though I see Doc 1 in Tab 1 and Doc 2 in Tab 2.

I see. Thank you very much for your explanation!