\mode<presentation>

\setbeamerfont{title}{size=\large,shape=\bfseries}
\setbeamerfont{subtitle}{size=\normalsize,shape=\bfseries}
\setbeamerfont{frametitle}{size=\large,shape=\bfseries}
\setbeamerfont{institute}{size=\small}
\setbeamerfont{date}{size=\small}

\mode<all>