Im using fontspec to have Arial in my scrartcl -document. For some reason this Arial is not applied to sectiontitle/subsectiontitle. Compiling with Xelatex
\documentclass[a4paper]{scrartcl}
%%%%%%%%%%%%%%%%%% Font %%%%%%%%%%%%%
\usepackage{fontspec}
\setmainfont{Arial}
%%%%%%%%%%% header %%%%%%%%%%%%%%%%%%
\usepackage[headsepline=0.75pt]{scrlayer-scrpage}
\renewcommand*{\headfont}{\normalfont}
\clearpairofpagestyles
\automark[section]{section}
\ihead{\headmark}
\ohead{\pagemark}
\begin{document}
\tableofcontents
\section{Section 1}
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\subsection{Subsection 1}
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\subsubsection{Subsubsection 1}
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\end{document}
