Remove textquotedblplain from preamble

[ehud.behar at protonmail.com]

I noticed that LyX adds the following to my document preable:

%%%% LyX specific LaTeX commands.
\providecommand\textquotedblplain{%
\bgroup\addfontfeatures{Mapping=}\char34\egroup}

Where in the document settings or in the LyX preferences is the specific setting that is related to the above? How do I remove it?
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