像这样吗?
\documentclass[t,aspectratio=169]{beamer}
\usepackage{blindtext}
\usecolortheme{default}
\usetheme[width=2.3cm]{Hannover}
\setbeamertemplate{frametitle}{
\hfill
\insertframetitle}
\begin{document}
\begin{frame}
\frametitle{abc abc}
\blindtext
\end{frame}
\end{document}