header.tex

\documentclass[headings=standardclasses, numbers=noenddot, a4paper, oneside, fontsize=12pt]{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage{mathptmx}
\usepackage[T1]{fontenc}
\usepackage[ngerman]{babel}
\usepackage[all]{nowidow}
\usepackage[final]{listings}
\usepackage{ltablex}
\usepackage{caption}
\usepackage[title]{appendix}
\usepackage{setspace}
\usepackage[backend=biber,style=numeric-comp,citestyle=verbose-note,autocite=footnote,labelnumber=true]{biblatex}
\usepackage{graphicx}
\usepackage[german]{csquotes}
\usepackage{fancyhdr}
\usepackage{geometry}
\usepackage{xurl}
\usepackage[multiple]{footmisc}
\usepackage[table]{xcolor}
\usepackage{amssymb}
\usepackage[letterspace=250]{microtype}
\usepackage{hhline}
\usepackage{wrapfig}
\usepackage{xr-hyper}
\usepackage{makecell}
\usepackage[
  bookmarks=true,
  bookmarksopen=true,
  bookmarksnumbered=true,
  breaklinks=true,
  colorlinks=true,
  linkcolor=black,
  anchorcolor=black,
  citecolor=black,
  filecolor=black,
  menucolor=black,
  urlcolor=black
]{hyperref}
\usepackage{glossaries-extra} % load after hyperref

\input{abbrev}

\newcommand{\sectionbreak}{\clearpage}
\geometry{top=30mm, bottom=30mm, left=30mm,right=25mm}


\fancypagestyle{sta}{%
  \fancyhf{}%clear all headers and footers fields
  \chead{\thepage} %prints the page number on the right side of the header
}

\bibliography{src.bib}

\lstset{
  basicstyle=\ttfamily,
  columns=fullflexible,
  frame=single,
  breaklines=true,
  postbreak=\mbox{$\hookrightarrow$\space},
}

\renewcommand{\baselinestretch}{1.3}

\setabbreviationstyle{short-long}