Hans van der Meer via ntg-context schrieb am 22.11.2023 um 15:45:
> But changing the width of the section in the middle is not changing. 
> Adapt \textwidth narrows the textwidth but does not allow wider margins.
> see next example. So how to adapt the page to for example:
> [leftmargin 40mm][middle what is left][rightmargin 60mm]
> this should leave 210-40-60=110mm in the middle, but doesn't.
> The textwidth is narrowed but the margins refuse to obey their setting.
>
> yours sincerely
> dr. Hans van der Meer
>
> \setuppapersize[A4][A4]
> \setuplayout[leftmargin=40mm,rightmargin=60mm,textwidth=110mm]
> \showframe
> \starttext
> setuplayout: leftmargin=40mm, rightmargin=60mm, textwidth=110mm\crlf
> abc\dotfill xyz\crlf
> \stoptext

Alternative 1:

\setuplayout
   [backspace=40mm,
    width=110mm]

\showframe

\starttext
\page[empty]
\stoptext

Alternative 2:

\setuplayout
   [backspace=40mm,
    cutspace=60mm,
    width=middle]

\showframe

\starttext
\page[empty]
\stoptext

Wolfgang