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<p style="margin:0cm">Hello :</p>
<p style="margin:0cm"><o:p> </o:p></p>
<p style="margin:0cm">I finally found a solution by forcing any plain style to be empty (I do not use any plain style in my document).</p>
<p style="margin:0cm"><o:p> </o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\documentclass[a4paper,11pt,twoside]{book}<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\RequirePackage{imakeidx}<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\usepackage[T1]{fontenc}<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\usepackage[latin1]{inputenc}<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\usepackage[french]{babel}<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\usepackage{fancyhdr}<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\usepackage{lipsum}<o:p></o:p></p>
<p style="margin:0cm;-qt-paragraph-type:empty;-qt-block-indent:0">% code Added to force plain to be empty<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\makeatletter<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0"> \let\ps@plain\ps@empty<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\makeatother</p>
<p style="margin:0cm"><o:p> </o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\selectlanguage{french}<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\indexsetup{level=\chapter*}<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\makeindex[intoc=true, title=Index]<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\pagestyle{fancy}<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\fancyhf{}<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\renewcommand{\headrulewidth}{0.4pt}<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\fancyhead[COE]{\textit{\nouppercase{\leftmark}}}<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\fancyhead[ROLE]{\thepage}<o:p></o:p></p>
<p style="margin:0cm;-qt-paragraph-type:empty;-qt-block-indent:0"><o:p> </o:p></p>
<p style="margin:0cm;-qt-block-indent:0">% *** DOCUMENT<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\begin{document}<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\title{ test }<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\maketitle<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\chapter{text}<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\thispagestyle{empty}<o:p></o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\lipsum{1} \index{\lipsum}<o:p></o:p></p>
<p style="margin:0cm;-qt-paragraph-type:empty;-qt-block-indent:0"><o:p> </o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\printindex<o:p></o:p></p>
<p style="margin:0cm;-qt-paragraph-type:empty;-qt-block-indent:0"><o:p> </o:p></p>
<p style="margin:0cm;-qt-block-indent:0">\end{document}<o:p></o:p></p>
<p style="margin:0cm;-qt-paragraph-type:empty;-qt-block-indent:0"><o:p> </o:p></p>
<p class="MsoNormal" style="-qt-paragraph-type:empty;-qt-block-indent:0"><o:p> </o:p></p>
<p class="MsoNormal">----- configuration info -----</p>
<p class="MsoNormal">TeXworks version : 0.6.7 (MiKTeX 22.8.28)</p>
<p class="MsoNormal">Install location : C:/Users/Utilisateur/AppData/Local/Programs/MiKTeX/miktex/bin/x64/miktex-texworks.exe</p>
<p class="MsoNormal">Library path : C:/Users/Utilisateur/AppData/Roaming/TUG/TeXworks/</p>
<p class="MsoNormal">pdfTeX location : C:/Users/Utilisateur/AppData/Local/Programs/MiKTeX/miktex/bin/x64/pdftex.exe</p>
<p class="MsoNormal">Operating system : Windows 10.0.19044</p>
<p class="MsoNormal">Qt version : 5.15.2 (build) / 5.15.2 (runtime)</p>
<p class="MsoNormal">------------------------------</p>
<p class="MsoNormal">Envoyé à partir de <a href="https://go.microsoft.com/fwlink/?LinkId=550986">
Courrier</a> pour Windows</p>
<p class="MsoNormal"><o:p> </o:p></p>
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