\documentclass[aspectratio=169]{beamer}

\usepackage[ngerman]{babel}
\usepackage[ngerman]{isodate}

\setbeamertemplate{navigation symbols}{}
\usetheme{tvstud}

\author{The Author}
\title{Work Culture}

\AtBeginSection[]{
  \begin{frame}{Inhalt}
    \small \tableofcontents[currentsection, hideothersubsections]
  \end{frame}
}

\begin{document}

\begin{frame}
    \titlepage
\end{frame}

\section{Test}

\begin{frame}{Test}
    \LARGE TVStud
\end{frame}

\section{Test2}

\begin{frame}{Test2}
    \begin{itemize}
        \item Auf-
        \item zähl-
        \item ungs-
        \item lis-
        \item te
    \end{itemize}
\end{frame}

\section{Test3}

\begin{frame}{Test3}
    \begin{enumerate}
        \item Auf-
        \item zähl-
        \item ungs-
        \item lis-
        \item te
    \end{enumerate}
\end{frame}

\end{document}

\endinput