Section title gets too long in header

Question

On page 9 of the generated document, you can see that the section title is so long that is gets on two lines and overrides the chapter title. In some programming languages, I would think of including some kind of "truncate" version in my header definition. I also read things about having shorter versions of chapter/section title, (something like \sectionmark) , but this was not recognised by my compiler.

What would be a way to have a shorter title in header.

Code: Main.tex

    %Preamble
    \documentclass[a4paper,french,oneside,openright]{book}
\usepackage{afterpage}
\newcommand{\blankpage}{
    \null
    \thispagestyle{empty}
    \addtocounter{page}{-1}
    \newpage
    }

\usepackage[french]{babel}
\usepackage{fancyhdr}
\usepackage{lipsum}

\usepackage{tocloft,calc}
\renewcommand{\cftchappresnum}{Chapter }
\AtBeginDocument{\addtolength\cftchapnumwidth{\widthof{\bfseries Chapter }}}


\title{Title}
\author{Name}
\date{2020}

\begin{document}
    \input{Pages/TitlePage.tex}
    \input{Pages/Thanks.tex}


    \tableofcontents


\pagestyle{fancy}
\lfoot{Title}
\rfoot{Page \thepage/\pageref{LastPage}}
\renewcommand{\headrulewidth}{0.0pt}
\renewcommand{\footrulewidth}{0.1pt}
\fancypagestyle{plain}{%
  \fancyhf{}%
  \fancyfoot[L]{Title}%
  \fancyfoot[R]{Page \thepage/\pageref{LastPage}}%
  \renewcommand{\headrulewidth}{0pt}% Line at the header invisible
  \renewcommand{\footrulewidth}{0.1pt}% Line at the footer visible
}
    \chapter{Introduction}
        \section{Introduction}
        \lipsum
    \chapter{Chapter title}
        \section{This section title is toooooooooooooooooooooooooooo long}
        \lipsum
    \chapter{Chapter title}
        \section{SectionTitle}
        \lipsum
    \chapter{Chapter title}
        \section{SectionTitle}
        \lipsum
    \chapter{Chapter title}
        \section{SectionTitle}
        \lipsum
    \chapter{Chapter title}
        \section{SectionTitle}
        \lipsum
    \chapter{Chapter title}
        %\section{SectionTitle}  %Testing what happens in table of contents when there is a chapter without section.
        \lipsum
    \chapter{Chapter title}
        \section{SectionTitle}
        \lipsum
\end{document}

Pages\TitlePage.tex

\begin{titlepage}
\newcommand{\HRule}{\rule{\linewidth}{0.5mm}}
\HRule \[0.9cm]
\begin{center}
    \textsc{\Huge Title}\[1cm]
    \textsc{\LARGE Subtitle}\[1.5cm]
\end{center}
\HRule \[1.5cm]
\begin{center} \Large
    \begin{tabular}{ l r }

        \emph{Text} & Text\ 
        \emph{Text} & Text
    \end{tabular}
\end{center}
\vfill
\begin{center} \large
    \begin{tabular}{\textwidth}{@{\extracolsep{\fill}} l r @{}}
        \ Text & Text\
        \ Text & Text\
        \ Text & Text\
        \ Text & Text\
        \ Text & Text
    \end{tabular}
\end{center}
\afterpage{\blankpage}
\end{titlepage}

Pages\Thanks.tex

\pagestyle{empty}
\part*{Thanks}
\blankpage

You can use the optional argument of \section to define a short version for the header.(and the table of contents). — Bernard, Mar 07 '20 at 21:15
Thanks I didn't know you could write this: \section[test]{Section 4} — TTT, Mar 07 '20 at 21:20
Hello, I back working on this document ... I notice 2 problems with this solution: I get titles overlapping on two lines ... I truncate what I think would be enough from section optional name, then both titles get condense on one single line. And I come to situations where I cannot have a single word in my section name without overlapping the chaptername. Hence I tried removed the shortened title like this: \section[]{Section X title} ... but then my sections don't have a title in my table of content... I don"t think that the shortened title should be impacting the table of content at all... — TTT, May 14 '20 at 19:19
I found a solution to this new problem here: https://tex.stackexchange.com/questions/343188/fancyhdr-chapter-and-section-titles-overlap-when-titles-are-long — TTT, May 16 '20 at 18:49
@TTT -- This sounds like a candidate for closing as a duplicate. Do you agree? — barbara beeton, Aug 20 '22 at 20:22
@barbarabeeton : Sorry, this is a bit old for me to remember everything very precisely, but if I wrote that the linked question solves the "new" problem, I likely meant that it did not solve the initial problem. I guess that my solution was a combination of Bernard's answer and of the linked answer. So no, it doesn't seem like a duplicate. — TTT, Aug 21 '22 at 20:56

Section title gets too long in header

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