documentclass[12pt,a4paper,twoside]{report} %openright

%Schriftart Arial - ACHTUNG: Compile with XeLaTeX (not PDFLaTeX)!
usepackage{fontspec}
defaultfontfeatures{Scale = MatchLowercase}
setmainfont{Arial}[Scale = 1.0]

%Seitenlayout
usepackage[top=2.5cm, bottom=2cm, left=2.5cm, right=2.5cm,paper=a4paper]{geometry}

%Deutsche Umlaute
usepackage{ngerman}

%Zitierungen in der richtigen Reihenfolge
usepackage{cite}

%Längenangaben für den Abstand zwischen zwei Absätzen.
usepackage{parskip}

%Zeilenabstand ändern
usepackage[onehalfspacing]{setspace}

%Farbige Texte etc
usepackage{color}

%Graphiken und Bilder
usepackage{graphicx}
usepackage{subfig}
usepackage{psfrag}
usepackage{wrapfig}

%Tabellenumgebung
usepackage{tabularx}
usepackage{booktabs} %toprule, midrule, bottomrule

%Mathematische Symbole und Zeichen
usepackage{amsmath}
usepackage{amssymb}
usepackage{mathrsfs}

%Algorithm Package
usepackage[ruled,vlined]{algorithm2e}

%Kopfzeile
usepackage{fancyhdr}

%Kapitelanzeige und -platzierung im Text
usepackage[clearempty]{titlesec}
titleformat{chapter}{normalfontfontsize{16pt}{0}bfseries}{thechapter.}{9pt}{}
titleformat{section}{normalfontfontsize{14pt}{0}bfseries}{thesection}{9pt}{}
titleformat{subsection}{normalfontfontsize{12pt}{0}bfseries}{thesubsection}{9pt}{}
titlespacing*{chapter}{0pt}{-22pt}{4pt}



%Verzeichnisse
usepackage[notindex, nottoc, numbib]{tocbibind} %TOC

usepackage{tocbasic}

DeclareTOCStyleEntry[
  indent=0pt,
  entrynumberformat=useprefixfigure{figurename},
  dynnumwidth,
  numsep=1em
]{tocline}{figure}
newcommanduseprefixfigure[2]{#1hspace{3pt}#2:hfill}



%Formatierung Inhaltsverzeichnis
usepackage{titletoc}
contentsmargin{2em}
dottedcontents{chapter}[21pt]{addvspace{15pt}bfseries}{20pt}{9.5pt}
dottedcontents{section}[50pt]{addvspace{3pt}}{2.3em}{9.5pt}
dottedcontents{subsection}[89pt]{addvspace{3pt}}{3.2em}{9.5pt}



% = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
% Formatierung der Kopfzeile
% = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
setlength{headheight}{0.6cm}

pagestyle{fancy}
fancyhf{}
fancyhead[EL,OR]{fontsize{8}{10} selectfont thepage}
fancyhead[ER,OL]{fontsize{8}{10} selectfont leftmark}
renewcommand{chaptermark}[1]{markboth{#1}{}}

fancypagestyle{plain}{
fancyhf{}
fancyhead[EL,OR]{fontsize{8}{10} selectfont thepage}
fancyhead[ER,OL]{fontsize{8}{10} selectfont nouppercase leftmark}
}


% = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
begin{document}
listoffigures
newpage

begin{figure}[!ht]
  centering
  rule{2cm}{2cm}
  caption{test figure one}
  label{fig:test1}
end{figure}

begin{figure}[!ht]
  centering
  rule{2cm}{2cm}
  caption{test figure two}
  label{fig:test2}
end{figure}


end{document}

newcommanduseprefixfigure[2]{#1hspace{3pt}#2:hfill}