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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Any way to remove ^L or ^M from some buffer outputs?
Date: Mon, 05 Oct 2020 12:43:44 +0300
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In-Reply-To: <20201005090644.GE4453@protected.rcdrun.com> (message from Jean
 Louis on Mon, 5 Oct 2020 12:06:44 +0300)
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> Date: Mon, 5 Oct 2020 12:06:44 +0300
> From: Jean Louis <bugs@gnu.support>
> 
> > But this assumes the buffer is editable ... besides
> > there should be a command (onee) that toggles the
> > visibility of that specific kind of representation,
> > whatever it is called, for _all_ such chars...
> 
> It is in read-only buffers

You can make it writable with "C-x C-q".