1

Actually, I'm using the bookest class but it inherits book class commands. The documentation is sparse, unfortunately, and CTAN's book class manual seems to be misfiled (downloading the documentation from the book class reveals a pdf about writing classes in general).

I would like to change the font size of the chapter title without affecting the size of the running headers. There has to be a simple way of doing this.

For:

\chapter{THIS CHAPTER TITLE IS TOO LONG}

substituting:

 \chapter{\huge THIS CHAPTER TITLE IS TOO LONG}

affected the running headers.

2

Or with the package titlesec. This allows to change the format in a way more flexible.

\documentclass{book}
\usepackage{titlesec}
\titleformat{\chapter}[display]{\bfseries\huge}{\chaptertitlename\space\thechapter}{20pt}{\huge}{}
\begin{document}
\chapter{THIS CHAPTER TITLE IS TOO LONG}
Text
\chapter{THIS CHAPTER TITLE IS OTHER TOO LONG}
Text\newpage Text
\end{document}
1

The chapter font is already \Huge in book class. Do you really want to change it?

There are few ways. One is to use sectsty

\documentclass{book}
\usepackage{lipsum}
\usepackage{sectsty}
\chapterfont{\huge}
\pagestyle{headings}
\begin{document}
  \chapter{THIS CHAPTER TITLE IS TOO LONG}
  \lipsum
  \chapter{Some Chapter}
  \lipsum
\end{document}

Another one is to use the optional argument to \chapter

\chapter[THIS CHAPTER TITLE IS TOO LONG]{\huge THIS CHAPTER TITLE IS TOO LONG}

hence it is used for running headings, toc etc.

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