Using JetBrainsMono as main font in Beamer?

Question

I am trying to use JetBrainsMono as the main font for beamer. I am using xelatex to compile the document and it seems to recognize the font but the font is not applied to the document.

\documentclass[aspectratio=169]{beamer}
\usepackage{fontspec}
\usepackage[spanish]{babel}
\newfontfamily{\jtbmedium}{JetBrainsMono-Medium}[
Path            =/home/dbarcene/.fonts/,
Extension       =.ttf,
Ligatures       =TeX]
\newfontfamily{\jtbbold}{JetBrainsMono-Bold}[
Path            =/home/dbarcene/.fonts/,
Extension       =.ttf,
Ligatures       =TeX]
\setmainfont{\jtbmedium}
\title{Long Title}
\author{John Doe}
\date\today
\begin{document}
\maketitle
\section{First Section}
\begin{frame}{First Frame}
Hello, world!
\end{frame}
\end{document}

What would be the proper procedure to use system fonts like JetBrainsMono in beamer? Thanks in advance.

Answer 1

Beamer uses sans serif text, you have to use \setsansfont instead of \setmainfont (or use a serif font theme instead)

% !TeX TS-program = lualatex
\documentclass[aspectratio=169]{beamer}
\usepackage{fontspec}
\usepackage[spanish]{babel}
\setsansfont{JetBrains Mono}
\title{Long Title}
\author{John Doe}
\date\today
\begin{document}
\maketitle
\section{First Section}
\begin{frame}{First Frame}
Hello, world!
\end{frame}
\end{document}

(Using your newly defined font families in \setsansfont doesn't work, so I'm using the font there directly, see The macros setmainfont and setsansfont do not accept the new command of a newfontfamily. Is there compatibility between them? for details)