Sans serif bold-faced small caps in section title

by Florian   Last Updated June 13, 2019 10:23 AM

I use PT Sans as my sans serif font. Thus, it is used in part, chapter, and section titles and so on. In my titles, I use small caps. As far as I understand it, the titles are boldfaced and it seems like PT Sans does not support boldfaced small caps. I read that KP-Fonts supports bf small caps but I can't get it to work in my MWE. The following MWE is still with PT Sans:

\documentclass[11pt]{book}

\usepackage{fontspec}
\setsansfont{PT Sans}

\begin{document}

\section{Title: \textsc{this should be in small caps}}

\begin{enumerate}
    \item Test: \textsc{this is indeed in small caps because it's in serife}
    \item Test\textsubscript{\textsc{this is indeed in small caps because it's in serife}}
    \item \textsf{Test: \textsc{this should be in small caps}}
    \item \textbf{\textsf{Test: \textsc{this should be in small caps}}}
    \item \textsf{\textbf{Test: \textsc{this should be in small caps}}}
    \item Test\textsubscript{\textbf{\textsf{\textsc{this should be in small caps}}}}
    \item Test\textsubscript{\textsf{\textbf{\textsc{this should be in small caps}}}}
\end{enumerate}

\end{document}

This gives me the following output:

enter image description here

So my main question is: How do I get bold-faced small caps in a sans serif font for part, chapter, and section titles etc.?

I'm a Latex and Stackexchange novice. I hope, I did everything correctly with the MWE and the output.

Also, of course, I searched for solutions for weeks and I found similar questions here but I'm still not good enough to get it working in Latex.

Thank you for your help.



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