How to set the navigation bar symbles don’t change line when catch next subsection in beamer

Question

i'm using theme Berlin,and the navigation bar symbles change a line when i use the \subsection
such that

in the northwest corner,the circles present in 3 lines
but how can i let them in a single line like this

i don't want to change the theme,can i do that while using berlin ?

Answer 1

You could use the compress class option:

wihout compress	with compress

---

Some background information from the beamer manual (from section 8.2.3 Navigation Bars):

\documentclass[compress]{beamer}

Tries to make all navigation bars as small as possible. For example, all small frame representations in the navigation bars for a single section are shown alongside each other. Normally, the representations for different subsections are shown in different lines. Furthermore, section and subsection navigations are compressed into one line.

---

\documentclass[compress]{beamer}
\usetheme{Berlin}

\begin{document}
\section{section}
\subsection{subsection}
\begin{frame}{frametitle}contents\end{frame}
\begin{frame}{frametitle}contents\end{frame}
\subsection{subsection}
\begin{frame}{frametitle}contents\end{frame}
\begin{frame}{frametitle}contents\end{frame}
\begin{frame}{frametitle}contents\end{frame}
\subsection{subsection}
\begin{frame}{frametitle}contents\end{frame}
\begin{frame}{frametitle}contents\end{frame}

\section{section}
\begin{frame}{frametitle}contents\end{frame}
\end{document}