org-footnote-section

org-footnote-section is a variable defined in `org-footnote.el'.
Its value is

"Footnotes"

Documentation:
Outline heading containing footnote definitions.

This can be nil, to place footnotes locally at the end of the
current outline node. If can also be the name of a special
outline heading under which footnotes should be put.

This variable defines the place where Org puts the definition
automatically, i.e. when creating the footnote, and when sorting
the notes. However, by hand you may place definitions
*anywhere*.

If this is a string, during export, all subtrees starting with
this heading will be ignored.

You can customize this variable.