This command (as most) will only take effect inside the group or environment in which it is defined; in particular, when put inside a frame environment

% ...

it will only affect the font sizes of this frame.

Examples of changing font size in Beamer

% Change font size in Beamer

% set a theme

% Dummy text


\begin{frame}{Frame with different font sizes and spacing }{size: 9pt, vskip=10pt}


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