Merci Bastien, 
I found a "buggy" solution: 

```
documentclass: scrartcl
fontsize: 12pt
pagesize: a4paper
lang: en-GB
header-includes:
- \usepackage{lipsum}
KOMAoption:
- landscape
```

Buggy because putting package lipsum after KOMAoption 

```
header-includes:
KOMAoption:
- landscape
- \usepackage{lipsum}
```

I get an error: 

```
Error producing PDF.
! Undefined control sequence.
l.132 \lipsum
```

Probably not the right way to do it. And if I add some other packages I need, it will become probably even more buggy ... 

Greetings to all

marek

On Monday, October 3, 2022 at 2:45:52 PM UTC+2 Bastien Dumont wrote:
Mmh, scrlayer-scrpage seems more specialized than that. But, even if you use a KOMA class, you can still set "geometry" in the YAML header.

Le Monday 03 October 2022 à 01:09:38AM, 'Marek Stepanek' via pandoc-discuss a écrit :
> Thx again. Perhaps somebody else could help me out, with the page layout. I
> made a Minimal (Non) working example:
>
>
>
> On Sunday, October 2, 2022 at 10:46:52 PM UTC+2 fiddlosopher wrote:
>
> I can't diagnose Koma layout issues. Maybe someone who is familiar with
> Koma can give more advice.
>
> > On Oct 2, 2022, at 12:35 PM, 'Marek Stepanek' via pandoc-discuss <
> pandoc-...@googlegroups.com> wrote:
> >
> > Thx fiddlosopher :-) Working. BUT the page layout is wrong: the body is
> very narrow, as if it is still portrait ... You need a minimal working
> example?
> >
> > On Sunday, October 2, 2022 at 9:30:05 PM UTC+2 fiddlosopher wrote:
> > Sorry, should be
> >
> > classoption:
> > - landscape
> >
> > > On Oct 2, 2022, at 12:29 PM, John MacFarlane <fiddlo...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
> > >
> > > Try classoptions?
> > >
> > >> On Oct 2, 2022, at 8:01 AM, 'Marek Stepanek' via pandoc-discuss <
> pandoc-...@googlegroups.com> wrote:
> > >>
> > >>
> > >> Hello all,
> > >>
> > >> little question: how to define landscape in KOMAoptions for the entire
> document? I tried with:
> > >>
> > >> ```
> > >> ---
> > >> documentclass: scrartcl
> > >> fontsize: 12pt
> > >> pagesize: a4paper
> > >> lang: en-GB
> > >> # fontfamily: libertinus
> > >> KOMAoptions:
> > >> - landscape
> > >> ```
> > >>
> > >> Not working. Thank you for your help
> > >>
> > >>
> > >> marek
> > >>
> > >>
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> ---
> documentclass: scrartcl
> fontsize: 12pt
> pagesize: a4paper
> lang: en-GB
> classoption:
> - landscape
> header-includes:
> - \usepackage{lipsum}
> include-before:
> - |
> ```{=latex}
> \begin{center}
> \hfill \break%
> \Huge{Minimal Non-Working Example of Landscape}\\[0.5em]
> \Large{ With Pandoc from Markdown to PDF }\\[1.2em]
> \Large{ Marek Stepanek }\\[1.2em]
> \large{Last Edit: Munich \today}\\[1.5em]
> \end{center}
> ```
> - \tableofcontents
> - \bigskip
> ---
>
> # Foreword
>
> This is a Minimal Non-Working example of wrong page-layout with `documentclass: scrartcl` in a YAML-Header. I need this layout for large and long tables. Probably this is not a Pandoc-Forum question, more a \LaTeX{} one? Sorry about it ... As you may see here: the page-layout is wrong. Is this really `pagesize: a4paper`?
>
> At the end I inserted my `Makefile`. Thank you for your help. Also, if it is off-topic here.
>
> # New Chapter
>
> ```{=latex}
> \lipsum[1]
> ```
>
> # Second Chapter
>
> ```{=latex}
> \lipsum[2]
> ```
>
> # Third Chapter
>
> ```{=latex}
> \lipsum[3]
> ```
>
> \newpage
>
> # Annex
>
> I am compiling this page with following `Makefile`:
>
> ```{.yaml}
>
> all: save typeset open
>
> .PHONY: all
> save:
> w
>
> typeset:
> pandoc \
> --from markdown \
> --to latex \
> --pdf-engine pdflatex \
> --out mwd.pdf \
> mwd.md
>
> open:
> open mwd.pdf
> ```
>
>
>

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