# Beamer change section/subsection pages font

@samcarter In my post Beamer change Section/Subsection pages I got a very good answer by samcarter How can I modify the code \setbeamercolor{section title}{bg=blue!75!black} \setbeamercolor{subsection title}{bg=cyan}

to define also the font size, instead of defining it in each section \section [Introduction]{\Large \bf Introduction}

You can change Beamer's fonts with the \setbeamerfont macro. The available options are described in Section 18.3.3 of the Beamer User's Guide.
\setbeamerfont{section title}{size=\Large,series=\bfseries}