如何缩小PPT中，对应引用的尺寸？ about sjtubeamer HOT 3 CLOSED

\renewcommand{\bibfont}{\tiny}

% 导言区添加 \usepackage{multicol}
\subsection{参考文献}
\begin{frame}
    \renewcommand{\bibfont}{\tiny}
    \setbeamertemplate{bibliography item}[text]
    \begin{multicols}{2}
        \printbibliography[heading=none]
    \end{multicols}
\end{frame}

\subsection{参考文献}
\begin{frame}[allowframebreaks]
    \renewcommand{\bibfont}{\tiny}
    \setbeamertemplate{bibliography item}[text]
    \printbibliography[heading=none]
\end{frame}