Set a different page layout for a single page in Memoir

layoutmarginsmemoir

I've set a page layout for my entire document with a space for margin notes with the following memoir commands:

\setstocksize{11in}{8.5in}
\settrims{0pt}{0pt}
\settypeblocksize{7.5in}{4.3in}{*}
\setlrmargins{1.5cm}{*}{*}
\setmarginnotes{20pt}{6.2cm}{0pt}

\checkandfixthelayout

The problem is that now I want some of the pages not to have the margin notes space, yet conserving the margins. That is, I want the blocksize to be extended on width, occupying the space of the margin notes. If it's possible, I'd like to have all the settings into an environment, such as the following:

\newenvironment{fullwidth}{%
   % The settings that would make the layout go fullwidth
}{%
   % The settings that would make the layout return to its normal lengths
}

I've seen this question as well, but for some reason it couldn't solve my case.

Best Answer

This is a workable? extension to my original partial answer. Check my redefinition of the fullwidth environment.

% mempageprob.tex  SE 643135

\documentclass[oneside]{memoir}

\setstocksize{11in}{8.5in}
\settrims{0pt}{0pt}
\settypeblocksize{7.5in}{4.3in}{*}
\setlrmargins{1.5cm}{*}{*}
\setmarginnotes{20pt}{6.2cm}{0pt}

\checkandfixthelayout

\usepackage{lipsum}

\newenvironment{fullwidth}{%
  \clearpage
  \settypeblocksize{7.5in}{3.3in}{*}   %% this doesn't work (reduces the header but not the text)
  \checkandfixthelayout
}{%
  \clearpage
  \settypeblocksize{7.5in}{4.3in}{*} 
  \checkandfixthelayout
   }

\begin{document}

\lipsum[1-3]

\begin{fullwidth}
  \lipsum[4-6]
\end{fullwidth}

\lipsum[7-9]

\newpage
\renewenvironment{fullwidth}{%
  \twocolumn
  \settypeblocksize{7.5in}{3.3in}{*}   
  \checkandfixthelayout
  \onecolumn}
{%
  \twocolumn
  \settypeblocksize{7.5in}{4.3in}{*} 
  \checkandfixthelayout
  \onecolumn}

\lipsum[1-3]

\begin{fullwidth}
  \lipsum[4-6]
\end{fullwidth}

\lipsum[7-9]

\end{document}

In (La)TeX the whole page layout is reconfigured when going between \onecolumn and \twocolumn. The revised version of fullwidth does the \two/onecolumn switching and gives, I believe, the desired result. Whenever LaTeX switches between \onecolumn and \twocolumn it starts a new page.

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