\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[osf,p]{libertinus}
\usepackage{microtype}
\usepackage[pdfusetitle,hidelinks]{hyperref}
\usepackage[english]{babel}

\usepackage[series={},nocritical,noend,noeledsec,nofamiliar,noledgroup]{reledmac}
\usepackage[movecolumnspositiononrightpage]{reledpar}
\setlength{\columnrulewidth}{0.4pt}
\setlength{\Lcolwidth}{0.65\textwidth}
\setlength{\Rcolwidth}{0.25\textwidth}

\begin{document}
\title{Working with outside and inside columns}
\date{}
\maketitle
\begin{abstract}
This file shows an example of the \verb+movecolumnspositiononrightpage+ option in action. This option allows to have inside and outside columns, rather than left and right columns.
\end{abstract}
\AtBeginPairs{\sloppy}
\begin{pairs}
    \begin{Leftside}
        \beginnumbering
            \pstart
                Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph.
            \pend
            \pstart
                Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.
            \pend
                        \pstart
                Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph.
            \pend
            \pstart
                Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.
            \pend
                        \pstart
                Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph.
            \pend
            \pstart
                Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.
            \pend
                        \pstart
                Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph.
            \pend
            \pstart
                Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.
            \pend
                        \pstart
                Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph.
            \pend
            \pstart
                Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.
            \pend
                        \pstart
                Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph.
            \pend
            \pstart
                Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.
            \pend
                        \pstart
                Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph.
            \pend
            \pstart
                Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.
            \pend
                        \pstart
                Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph.
            \pend
            \pstart
                Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.
            \pend
                        \pstart
                Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph.
            \pend
            \pstart
                Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.
            \pend
                        \pstart
                Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph.
            \pend
            \pstart
                Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.
            \pend
                        \pstart
                Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph.
            \pend
            \pstart
                Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.
            \pend
                        \pstart
                Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph. Inside paragraph.
            \pend
            \pstart
                Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.  Other inside paragraph.
            \pend
        \endnumbering
    \end{Leftside}
    \begin{Rightside}
        \beginnumbering
            \pstart
                Outside paragraph. Outside paragraph. Outside paragraph. Outside paragraph.
            \pend
            \pstart
                Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph.
            \pend
                        \pstart
                Outside paragraph. Outside paragraph. Outside paragraph. Outside paragraph.
            \pend
            \pstart
                Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph.
            \pend
                        \pstart
                Outside paragraph. Outside paragraph. Outside paragraph. Outside paragraph.
            \pend
            \pstart
                Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph.
            \pend
                        \pstart
                Outside paragraph. Outside paragraph. Outside paragraph. Outside paragraph.
            \pend
            \pstart
                Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph.
            \pend
                        \pstart
                Outside paragraph. Outside paragraph. Outside paragraph. Outside paragraph.
            \pend
            \pstart
                Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph.
            \pend
                        \pstart
                Outside paragraph. Outside paragraph. Outside paragraph. Outside paragraph.
            \pend
            \pstart
                Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph.
            \pend
                        \pstart
                Outside paragraph. Outside paragraph. Outside paragraph. Outside paragraph.
            \pend
            \pstart
                Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph.
            \pend
                        \pstart
                Outside paragraph. Outside paragraph. Outside paragraph. Outside paragraph.
            \pend
            \pstart
                Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph.
            \pend
                        \pstart
                Outside paragraph. Outside paragraph. Outside paragraph. Outside paragraph.
            \pend
            \pstart
                Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph.
            \pend
                        \pstart
                Outside paragraph. Outside paragraph. Outside paragraph. Outside paragraph.
            \pend
            \pstart
                Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph.
            \pend
                        \pstart
                Outside paragraph. Outside paragraph. Outside paragraph. Outside paragraph.
            \pend
            \pstart
                Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph.
            \pend
                        \pstart
                Outside paragraph. Outside paragraph. Outside paragraph. Outside paragraph.
            \pend
            \pstart
                Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph. Other outside paragraph.
            \pend
        \endnumbering
    \end{Rightside}

\end{pairs}
\Columns

\end{document}