\documentclass[10pt]{book}
\usepackage{geometry}
\geometry{
total={130mm,212mm},
  }
%\usepackage[showframe,b5paper]{geometry}
%
%\setcounter{secnumdepth}{-4}
%\setcounter{tocdepth}{0}
\usepackage{mfirstuc}% mettre en majuscule une 1re letter
%
%\usepackage[fontsize=10]{fontsize}
%
%\sepackage[cam]{crop}
%\usepackage[cross,b5,center]{crop}
%\usepackage[showframe,b5paper,verbose]{geometry}
\counterwithin{figure}{section}
%\usepackage{fontspec}
%\usepackage{lmodern}
\usepackage{ebgaramond}
\usepackage{unicode-math}
\setmathfont{Garamond-Math}

\usepackage[export]{adjustbox}
\usepackage{wrapfig}

\usepackage[french]{babel}
%\frenchsetup{og=«, fg=»} % inutile avec lualatex

\usepackage{textcomp}% des symboles?
\usepackage{epigraph,csquotes,verse}

\usepackage{graphicx}
\usepackage{layout}

%
\usepackage{titlesec}
\usepackage{chngcntr}
\usepackage{upquote}
\usepackage{microtype}
\usepackage{xcolor}
\usepackage{longtable}
\usepackage{booktabs}
\usepackage{bookmark}
\usepackage{array}
\usepackage{calc}

%\usepackage{footnotehyper}
%\usepackage{footnote}
\usepackage{soul}
\usepackage{multirow}
\usepackage{placeins}% pour avoir \FloatBarrier
%
\usepackage{fancyhdr}

%
\usepackage[style=authoryear]{biblatex}
\usepackage{citeall}
\addbibresource{}
%
\providecommand{\tightlist}{%
	   \setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}

% \renewcommand{\thesection}{}
% \renewcommand{\thesubsection}{\arabic{section}.\arabic{subsection}}
% \makeatletter
% \def\@seccntformat#1{\csname #1ignore\expandafter\endcsname\csname the#1\endcsname\quad}
% \let\sectionignore\@gobbletwo
% \let\latex@numberline\numberline
% \def\numberline#1{\if\relax#1\relax\else\latex@numberline{#1}\fi}
% \makeatother

\newcommand{\mysection}[2]{\section*{ #2}}

\newcommand{\titre}[5]{% date / type /auteur/ membre/ titre
  {\raggedright{\textsl{\bfseries\large \capitalisewords{#1}}}}\\%
  {\raggedright{\bfseries\large \capitalisewords{{#2}} de #3} \textsl{#4}}%
   \addcontentsline{toc}{section}{{\bfseries #1.} \capitalisewords{#2}
     de #3, #4.\\\textsl{#5}}%
  \vspace*{24pt}%
  \begin{center}{\Large\bfseries #5}\end{center}%
  \vspace*{5mm}%
  \fancyhead{}%
  \fancyhead[CE]{Mémoires: 2\ieme{} partie}%
  \fancyhead[CO]{#3. #5}%
}

\newcommand{\epigraphnorule}[1]{%
\vspace*{\beforeepigraphskip}%
\begin{flushright}%
  \begin{minipage}{\epigraphwidth}\raggedright\small
#1%
\end{minipage}%
\end{flushright}%
\vspace*{\afterepigraphskip}%
}
\renewcommand{\thefigure}{\arabic{figure}}
% \makeatletter

% \renewcommand\section{\@startsection {section}{1}{\z@}%
%                                    {-3.5ex \@plus -1ex \@minus -.2ex}%
%                                    {-1em}%
%                                    {\normalfont\large\scshape}}

% \makeatother
%
\titleformat{\section}[block]{\large\bfseries}{}{100em}{}
\titleformat{\subsection}{\normalsize\bfseries}{}{}{}
%
% \makeatletter
% \titleformat{\part}[display]
%   {\Huge\scshape\filright}
%   {\partname~}
%   {20pt}
%   \makeatother
%
\begin{document}%\layout

%\pagestyle{plain}
\pagestyle{fancy}
\newcounter{none}
%\fancyhead{} 
%\fancyhead[RO,LE]{\textbf{blabla}}
%@@debut
% \maketitle

  $body$
  
%@@fin
\tableofcontents
\end{document}