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From: "Dr. Engelbert Buxbauum" <engelbert_buxbaum@hotmail.com>
Newsgroups: comp.text.tex
Subject: Re: Setting Beamer aspect ratio / screen size
Date: Sat, 12 Apr 2025 09:34:20 +0200
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In article <vsrcvf$2e6ds$1@dont-email.me>, heller@deepsoft.com says...
> 
> beamer version: 2022/09/13 v3.68
> texlive-base version: 2022.20230122-3
> 
> How do I set the Beamer aspect ratio / screen size?
> 
> Beamer seems to default to a 3:4 aspect ratio, but modern screens are 16:9,
> how can I make beamer use a wider aspect ratio?  I'm not finding an option for
> that.

The manual describes that in section "8.3 Frame and Margin Sizes": 
\documentclass[aspectratio=169]{beamer}