I try to reduce and better align my caption text (and not the automatic label "figure.") text with memoir. I try this this without success, and i search in the memoir documentation, and try some commands, without success too.
My example code :
\documentclass[a4paper, 12pt,twoside, openright]{memoir}
\usepackage{polyglossia}
\setdefaultlanguage{french}
\usepackage{fontspec}
\usepackage[usenames,dvipsnames]{xcolor}
\usepackage[autostyle=true,french=guillemets,maxlevel=3]{csquotes}
\usepackage{xparse}
\usepackage{graphicx}
\usepackage[protrusion=true]{microtype}
\graphicspath{{FigureIntroduction/}}
\tolerance=1000
\sidecapmargin{outer}
\setsidecappos{t}
\makeatletter
%\renewcommand{\fnum@figure}[1]{\textbf{\figurename~\thefigure}}
\renewcommand{\fnum@figure}{\textbf{Figure~\thefigure~--}}
\makeatother
\captiondelim{\newline}
\captionstyle{\centerlastline}% for title
\setlength{\belowcaptionskip}{\onelineskip}
\setlength{\footnotesep}{\onelineskip}
\captionnamefont{\small}
\captiontitlefont{\small}
\begin{document}
\chapterstyle{bringhurst}
\begin{figure}[!h]
\begin{sidecaption}[fortoc]{Le "champignon informationnel" proposé par Frédéric Kaplan est révélateur de l'augmentation du champs d'expérimentation rendu possible par la numérisation des données, puis la simulation numérique.}[fig:I_Champi]
%\resizebox*{\textwidth}{!}{\includegraphics{champignonKaplan.png}}
\includegraphics[width=\linewidth]{champignonKaplan.png}
\end{sidecaption}
\end{figure}
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\begin{figure}[!h]
\begin{sidecaption}[fortoc]{Le "champignon informationnel" proposé par Frédéric Kaplan est révélateur de l'augmentation du champs d'expérimentation rendu possible par la numérisation des donnéeeees, puis la simulation numérique.}[fig:Id_Champi]
%\resizebox*{\textwidth}{!}{\includegraphics{champignonKaplan.png}}
\includegraphics[width=\linewidth]{champignonKaplan.png}
\end{sidecaption}
\end{figure}
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\end{document}
And the result :
\usepackage{ragged2e}
and\renewcommand*{\sidecapstyle}{\tiny\captionstyle{\justifying}}
. This should give 'tiny'-sized captions that are fully justified courtesy of theragged2e
package. This may well produce horrendous spaces in your captions, so you'll need to watch them closely.