我想允许在 Beamer 演示文稿的导航栏中长章节和小节标题中换行。例如，在以下幻灯片中：
我想允许 Ubication、contact 和 transport 子部分换行。此外，最好允许子部分第二行的条目左对齐。我附上了演示代码：
\documentclass{beamer}
%\usetheme{Dresden}
\usetheme{Berlin}
%\useoutertheme{smoothbars}
\setbeamerfont{section in sidebar}{size=normalsize}
\setbeamerfont{subsection in sidebar}{size=normalsize}
\setbeamertemplate{footline}[frame number]{}
\usepackage{tcolorbox}
\definecolor{mycolor}{rgb}{0.122, 0.435, 0.698}
\newcommand{\mainTitle}{School of Sociology and Politics}
\newtcolorbox{titulo}{colback=red!5!white,colframe=red!5!white}
\newtcolorbox{menu2}{colback=gray!5!white,colframe=gray!25!blue}
\makeatother
% change definition of section and subsection navigation bars
\makeatletter
\def\insertsectionnavigationhorizontal#1#2#3{%
\hbox to #1{{%
\def\slideentry##1##2##3##4##5##6{}%
#2\hskip.3cm%
\newdimen\tmp@parbox%
\setlength\tmp@parbox{#1}%
\addtolength\tmp@parbox{-.6cm}%
\parbox{\tmp@parbox}{\raggedright%
\usebeamerfont{section in head/foot}\usebeamercolor[fg]{section in head/foot}%
\setbox\beamer@sectionbox=\hbox{}%
\ht\beamer@sectionbox=1.875ex%
\dp\beamer@sectionbox=0.75ex%
\hskip-1.875ex plus-1fill\dohead%
\box\beamer@sectionbox}\hfil\hskip.3cm%
#3
}}}
\def\insertsubsectionnavigationhorizontal#1#2#3{%
\hbox to #1{{%
\newdimen\tmp@parbox%
\setlength\tmp@parbox{#1}%
\addtolength\tmp@parbox{-.6cm}%
\parbox{\tmp@parbox}{\raggedright%
\usebeamerfont{subsection in head/foot}\usebeamercolor[fg]{subsection in head/foot}%
\beamer@currentsubsection=0%
\def\sectionentry##1##2##3##4##5{}%
\def\slideentry##1##2##3##4##5##6{\ifnum##6=\c@part\ifnum##1=\c@section%
\ifnum##2>\beamer@currentsubsection%
\beamer@currentsubsection=##2%
\box\beamer@sectionbox\hskip1.875ex plus1fill%
\setbox\beamer@sectionbox=
\hbox{\def\insertsubsectionhead{##5}%
\def\insertsectionheadnumber{##1}%
\def\insertsubsectionheadnumber{##2}%
\def\insertpartheadnumber{##6}%
\ifnum\c@subsection=##2%
\beamer@link(##4){{\usebeamertemplate{subsection in head/foot}}}\else%
\beamer@link(##4){{\usebeamertemplate{subsection in head/foot shaded}}}\fi}%
\ht\beamer@sectionbox=1.875ex%
\dp\beamer@sectionbox=0.75ex%
\fi\fi\fi\ignorespaces}%
#2\hskip.3cm\setbox\beamer@sectionbox=\hbox{}%
\hskip-1.875ex plus-1fill\dohead%
\box\beamer@sectionbox}\hfil\hskip.3cm%
#3}}}
\makeatother
\setbeamertemplate{headline}
{%
\hspace{0.5cm}
\begin{titulo}
{\Large{\mainTitle}}
\end{titulo}
\hspace{1cm}
\newline
{\small
\begin{beamercolorbox}[ht=4.25ex,dp=2.75ex]{section in head/foot}
\insertsectionnavigationhorizontal{\paperwidth}{}{\hfill\hfill}
\end{beamercolorbox}%
}
{\small
\begin{beamercolorbox}[ht=4.9ex,dp=3.75ex,%
leftskip=0.2cm, rightskip=.3cm plus1fil]{subsection in head/foot}
%\usebeamerfont{subsection in head/foot}
%\raggedleft
\insertsubsectionnavigationhorizontal{\paperwidth}{}{\hfill}
\end{beamercolorbox}%
}
}
%\newmdenv[innerlinewidth=0.5pt, roundcorner=4pt,linecolor=mycolor,innerleftmargin=6pt,
%innerrightmargin=6pt,innertopmargin=6pt,innerbottommargin=6pt]{menu1}
\title[]{School of Sociology and Politics}
\begin{document}
\section{School}
\subsection{Presentation}
\begin{frame}
\end{frame}
\subsection{Structure}
\begin{frame}
\end{frame}
\subsection{Staff}
\begin{frame}
\end{frame}
\subsection{Ubication, contact \newline and transport}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\subsection{Documents}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\subsection{Strategy and quality}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\subsection{News}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\section{Teaching}
\subsection{Degrees}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\subsection{Masters}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\subsection{Departments}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\subsection{Teachers}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\subsection{External practices \newline and employment}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\subsection{Final degree work}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\subsection{Open education}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\subsection{Teaching innovation}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\section{Students}
\subsection{Relevant information}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\subsection{Representation and associations}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\subsection{Tutorial actions}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\subsection{Participation}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\section{Movility}
\subsection{International}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\subsection{National - SICUE}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\section{Research}
\subsection{Polisocio - LAB}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\subsection{Research groups}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\subsection{Transference}
\begin{frame}\frametitle{\mainTitle}
\end{frame}
\end{document}
提前致谢
曼努埃尔·戈麦斯-奥尔梅多