%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  2. Auflage
%% 
%%  Beispiel 04-02-3 auf Seite 101.
%% 
%%  Copyright (C) 2016 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1,2,3,4
%% 
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{99.58464pt}
\usepackage[T1]{fontenc}
%StartShownPreambleCommands
\usepackage[a4paper]{geometry}\geometry{hmargin=3cm,showframe}
%StopShownPreambleCommands
\begin{document}
\sloppy\fontsize{2.5cm}{2.7cm}\selectfont     Layout L1
\newgeometry{left=2cm,right=1cm,bottom=1cm}   Neues Layout L2
\restoregeometry                              Altes Layout L1
\newgeometry{margin=1cm,includeheadfoot}      Neues Layout L3
\end{document}