% chapterthumbexample.tex
% Copyright 2008 Markus Kohm
% 
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3
% of this license or (at your option) any later version.
% The latest version of this license is in
% http://www.latex-project.org/lppl.txt
% and version 1.3 or later is part of all distributions of LaTeX
% version 2005/12/01 or later.
% 
% This work has the LPPL maintenance status `maintained'.
% 
% The Current Maintainer of this work is Markus Kohm.
% 
% This work consists of this file only.
%-----------------------------------------------------------------------
\documentclass{scrbook}
\usepackage[ngerman]{babel}
\usepackage{chapterthumb}
\usepackage{scrlayer-scrpage}
\AddLayersToPageStyle{@everystyle@}{chapterthumb}
\addtokomafont{chapterthumb}{\bfseries}
\begin{document}
\chapter{Am Anfang beginnt es}\dots
\chapter{weiter}\dots
\chapter{und weiter}\dots
\chapter{und noch weiter}\dots
\chapter{Und immer weiter}\dots
\chapter{Geht die Reise}\dots
\chapter{Hinaus}\dots
\chapter{Und weiter hinaus}\dots
\chapter{Immer weiter hinaus}\dots
\chapter{Bis zum Ende}
\end{document}
