[O] How to keep footnotes hidden when creating a new footnote

[Sharon Kimble]

I'm writing a document that currently has over 500 footnotes, which is
then exported to latex and subsequently built into a PDF file. But every
time that I write a new footnote, all the other footnotes show as
visible, whereas previously they were hidden under their second-level
title.

How can I get the 'old' footnotes to remain hidden, unopened and not
visible please?

Thanks
Sharon.
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