Dr. Manuel Kuehner
* This question is related to https://topanswers.xyz/tex?q=2042.
* There is a unexpected side effects: **Unwanted page number** on **(1)** title page frame (`\maketitle`), on **(2)** section slides, and on **(3)** frames with the **`plain` option**.
* How can we remove the page numbers from frames that normally no not have a page number (metropolis default).
```
% LuaLaTeX
\documentclass{beamer}
\usetheme{metropolis}
\title{title}
\subtitle{subtitle}
\date{date}
\author{author}
\setbeamertemplate{footline}{}
\setbeamertemplate{navigation symbols}{\usebeamerfont{page number in head/foot}\usebeamercolor{page number in head/foot}\usebeamertemplate{page number in head/foot}}
\setbeamertemplate{page number in head/foot}[framenumber]
\begin{document}
\maketitle
\begin{frame}[plain]{TOC}
\tableofcontents
\end{frame}
\section{section}
\begin{frame}
\frametitle{frametitle}
abc\footnote{Footnote text.}
\end{frame}
\end{document}
```
