This is a sub-menu of the Note menu (from v6.4.0). These options allow the creation of footnotes from the current:
- Add Footnote As Sibling. The new note is created as the next sibling to the current note.
- Add Footnote As Child. The new note is created as a child of a sibling 'Notes' container.
Footnotes are described in more detail in Creating Footnote notes.