Modifying margins of the beamer slides

Using the following command about global declaration for sizes, we can easily modify the margin of beamer slides:

\setbeamersize{text margin left=<size>,text margin right=<size>}

The following code example corresponds to a simple frame with a modified beamer margin (1.5cm left and 2cm right):

% Modify Beamer margin
\documentclass{beamer}

% Theme choice
\usetheme{AnnArbor}

% Beamer margin
\setbeamersize
{
    text margin left=1.5cm,
    text margin right=2cm
}

% Dummy text
\usepackage{lipsum}

\begin{document}

\begin{frame}{Modified margins (1.5cm left, 2cm right)}
    \lipsum[2]
\end{frame}     
     
\end{document}

Compiling this code yields the following:

where default margins look as follows: