[Tex/LaTex] Changing width of column on one page only

multicol

I'm trying to create a page with two columns, on one page only, the rest should be with only one column.
I've tried the package multicoland that solves one part of my problem which is to get a divider line between the columns. For that I use

\setlength{\columnseprule}{0.5pt}
\def\columnseprulecolor{\color{orange}}

It seems like there is no way to change the width of the columns with multicol.
I've seen different approaches like using minipagebut that removes my separator.

Is there any way to do this? I've been at it for a couple of hours now and can't seem to find a nice easy way to do it.

And I'm using the latexmk -pdf file.tex in linux to create my pdf's whatever that latex package is called.

\documentclass{article}
\usepackage{multicol}

\setlength{\columnseprule}{0.5pt}
\def\columnseprulecolor{\color{orange}}

\begin{document}
\begin{multicols}{2}
[
\section*{First Section}
Section title, spanning.
]
This is the left column that I want to be 0.3 of \textwidth

\columnbreak

And here is the right column with \textwidth 0.7
\end{multicols}

Something else here. The text should not be multicolumned in this part

\end{document}

Best Answer

You can use the parcolumns package:

\documentclass{article}
\usepackage{microtype}
\usepackage{parcolumns}

\usepackage{kantlipsum}

\begin{document}

\begin{parcolumns}[colwidths={1=.3\textwidth},rulebetween=true]{2}
\colchunk{% left column
  \sloppy
  \kant[1]
}
\colchunk{% right column
  \kant[2-3]
}
\end{parcolumns}

\end{document}

If you want a colored rule, you have to patch a command

\documentclass{article}
\usepackage{microtype}
\usepackage{parcolumns}
\usepackage{xcolor}
\usepackage{xpatch}

\usepackage{kantlipsum}

\makeatletter
\xpatchcmd{\pc@placeboxes}
  {\vrule}{\begingroup\color{orange}\vrule width 1pt\endgroup}
  {}{}
\makeatother

\begin{document}

\begin{parcolumns}[colwidths={1=.3\textwidth},rulebetween=true]{2}
\colchunk{% left column
  \sloppy
  \kant[1]
}
\colchunk{% right column
  \kant[2-3]
}
\end{parcolumns}

\end{document}

enter image description here

However, it seems that a simple minipage could do:

\documentclass{article}
\usepackage{microtype}
\usepackage{xcolor}

\usepackage{kantlipsum}

\begin{document}

\noindent
\begin{minipage}[t]{\dimexpr.3\textwidth-\tabcolsep-.5pt}
\sloppy
\kant*[1]
\end{minipage}%
\hfill\begingroup\color{orange}\vrule width 1pt\endgroup\hfill
\begin{minipage}[t]{\dimexpr.7\textwidth-\tabcolsep-.5pt}
\kant*[2-3]
\end{minipage}

\end{document}

The output is essentially the same.

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