Since KOMA-Script 3.20 the classes provided an option egregdoesnotlikesansseriftitles that deactivates all sans serif defaults of the KOMA-Script classes. With KOMA-Script 3.39 this option has been replaced by sfdefaults with inverse logic. So with
\documentclass[sfdefaults=false]{scrartcl}
\usepackage[T1]{fontenc}
\usepackage[english]{babel}
\usepackage{blindtext}
\begin{document}
\title{Title}
\author{Author}
\maketitle
\Blinddocument
\begin{description}
\item[An item]\blindtext
\end{description}
\end{document}
you will see the same fonts for title and heading as with article.
The old option was a result of a comment of @egreg to Why does KOMA-Script mix serifs and sans-serifs?.
There is also an option emulatestandardclasses to make scrartcl even more article look-alike.
sfdefaults=falseinstead ofegregdoesnotlikesansseriftitles– samcarter_is_at_topanswers.xyz Jul 04 '23 at 11:54