Beamer-Metropolis: change font size for section pages

Question

I am using the metropolis theme for Beamer, but I find the font on section pages too big (as big as presentation title). I try to reduce it, but the setbeamerfont seems to only affect placement of the section title, not its size. Am I doing something wrong?

\documentclass{beamer}
\usetheme{metropolis}          
\setbeamerfont{section page}{size=\footnotesize} % only shifts placement
\begin{document}
  \section{First Section}
  \begin{frame}{First Frame}
    Hello, world!  
  \end{frame}
\end{document}

This problem seems to happen with either PDFLaTeX or XeLaTeX.

Answer 1

\documentclass{beamer}
\usetheme{metropolis}          
\setbeamerfont{section title}{size=\footnotesize}
\begin{document}
  \section{First Section}
  \begin{frame}{First Frame}
    Hello, world!  
  \end{frame}
\end{document}