The headers are defined in tufte-common.def
with \fancyhead
commands starting on line 1457 (version 2015/06/21 v3.5.2 Common code for the Tufte-LaTeX styles). You can redefine this to be printed in \normalsize
, which the style file defines to be larger.
Edit: used the MWE from the OP. Because it uses \mainmatter
, and tufte-book.cls
sets the headers in that command, you need to redefine that. You can choose to put the redefinition in the tufte-largeprint.sty
file or in the document itself. Here the modifications are shown in the document itself to make it self-contained. Note that in this case you need \makeatletter
and \makeatother
because there is an @
symbol in the code (in \boolean{@tufte@twoside}
).
\documentclass[b5paper]{tufte-book}
\usepackage{tufte-largeprint}
\makeatletter
\renewcommand\mainmatter{%
\cleardoublepage%
\@mainmattertrue%
\fancyhf{}%
\ifthenelse{\boolean{@tufte@twoside}}%
{% two-side
\renewcommand{\chaptermark}[1]{\markboth{##1}{}}%
\fancyhead[LE]{\normalsize\thepage\quad\smallcaps{\newlinetospace{\plaintitle}}}% book title
\fancyhead[RO]{\normalsize\smallcaps{\newlinetospace{\leftmark}}\quad\thepage}% chapter title
}%
{% one-side
\fancyhead[RE,RO]{\normalsize\smallcaps{\newlinetospace{\plaintitle}}\quad\thepage}% book title
}%
}
\makeatother
\title{Beer and frogs} \author[Ruth Lazkoz]{Ruth Lazkoz}
\begin{document}
\maketitle
\mainmatter
\chapter{Blaise Pascal}
\section{ inventor}
Soportamos un enorme peso sobre nuestras cabezas sin ser conscientes de ello
\newpage mas cosas
\end{document}
Result:
