Une possibilité est d’utiliser `beamer`, parce que `beamer` est bien adapté pour arranger quelque chose sur une seule page.
\documentclass{beamer}
\usepackage{beamerposter}
\usepackage{lmodern}
\usepackage{qrcode}
\usepackage{lipsum}
\setbeamertemplate{background canvas}{%
\color{white}\rule{.25\paperwidth}{\paperheight}%
\color{red!50!black}\rule{.5\paperwidth}{\paperheight}%
\color{white}\rule{.25\paperwidth}{\paperheight}%
}
\setbeamerfont{title}{size=\fontsize{92pt}{120pt}\selectfont}
\setbeamerfont{author}{size=\fontsize{48pt}{56pt}\selectfont}
\setbeamercolor{author}{fg=gray}
\setbeamerfont{institute}{size=\fontsize{32pt}{36pt}\selectfont}
\setbeamercolor{institute}{fg=gray}
\setbeamercolor{structure}{fg=black}
\setbeamerfont{structure}{size=\fontsize{48pt}{56pt}\selectfont,series=\bfseries}
\setbeamerfont{normal text}{size=\fontsize{32pt}{38pt}}
\renewcommand<>{\emph}[1]{{\only#2{\bfseries}#1}}
\setbeamertemplate{navigation symbols}{}
\author{Pauliono van Duck}
\institute{Tikzlings academy}
\title{Le Titre}
\begin{document}
\begin{frame}[plain]
\begin{columns}[onlytextwidth,T]
\begin{column}{0.23\textwidth}
\usebeamerfont{title}%
\usebeamercolor{title}%
\inserttitle%
\vskip1cm
\usebeamerfont{author}%
\usebeamercolor[fg]{author}%
\insertauthor%
\usebeamerfont{institute}%
\usebeamercolor[fg]{institute}%
\insertinstitute%
\usebeamerfont{normal text}
\vskip2cm
\structure{Introduction}
\vskip1cm
\lipsum[2]
\vskip2cm
\structure{Un diagramme}
\vskip1cm
\includegraphics[width=\textwidth]{example-image-duck}
\end{column}
\begin{column}{0.5\textwidth}
\centering
\begin{minipage}[c][.93\textheight][c]{.9\textwidth}
\vfill
\color{white}\fontsize{92pt}{120pt}\selectfont%
La découverte \emph{principale}.
Quelques mots sont \emph{en gras}
\vfill
{\setlength{\fboxsep}{1cm}
\fcolorbox{white}{white}{\color{black}\qrcode[hyperlink,height=10cm]{https://texnique.fr/osqa/}}}
\end{minipage}
\end{column}
\begin{column}{0.23\textwidth}
\usebeamerfont{normal text}
\structure{Un autre diagramme}
\vskip1cm
\includegraphics[width=\textwidth,page=2]{example-image-duck}
\end{column}
\end{columns}
\end{frame}
\end{document}
![alt text][1]
[1]: https://texnique.fr/osqa/upfiles/Screen_Shot_2019-08-08_at_19.14.55.png
