Mikael Sundqvist schrieb am 30.06.2020 um 22:03:
> Hi,
>
> say that I, for educational purposes, want to use \showframe for a
> couple of pages, and then want to hide the frames. What is the correct
> way of doing this? I have for now added a \begingroup and \endgroup, but
> then another document parameter that is set inside is cancelled after
> the \endgroup.
>
> I tried to look in the source, but could not find anything that worked
> (what I tried with was to use \setupbackgrounds[state=stop], but that
> was merely a guess, and it did not work).

There is no command to disable \showframe but you don't even need the
command to have frames. What \showframe does is to set a few values for
the \setupbackgrounds command which can be done by hand.

To make everything a bit nice I put the backgrounds setup in a
setup-block and call only these blocks in the document.

%%%% begin example
\startsetups[showframe]
   \setupbackgrounds [header,text,footer] [leftmargin,text,rightmargin]
[frame=on]
\stopsetups

\startsetups[hideframe]
   \setupbackgrounds [header,text,footer] [leftmargin,text,rightmargin]
[frame=off]
\stopsetups

\starttext

\input knuth

\page \setup[showframe]

\input knuth

\page \setup[hideframe]

\input knuth

\stoptext
%%%% end example

Wolfgang