drafttex_preamble.tex

\usepackage[T1]{fontenc}

% GEOMETRY
\usepackage[top=2cm,bottom=2.5cm,left=3.5cm,right=3.5cm,footskip=2cm,marginparwidth=5cm]{geometry}

% LINESPACING
\renewcommand{\baselinestretch}{1.25} 
\pagestyle{plain}

% FONTS
\usepackage{fontspec} 
\setmainfont[Ligatures=TeX,BoldFont = STIX2Text-Bold.otf, ItalicFont = STIX2Text-Italic.otf, BoldItalicFont = STIX2Text-BoldItalic.otf]{STIX2Text-Regular.otf}
\setmathfont{STIX2Math.otf}

% LINE NUMBERING
\usepackage{lineno}
\linenumbers

% FLUSH LEFT
\usepackage{ragged2e}
\setlength\RaggedRightParindent{\parindent} % default value of this parameter is `0pt`
\RaggedRight

% AUTHOR
\usepackage{authblk} 
\author[a]{Hans Kloss} 
\affil[a]{Institute of Being, Dasein University in Neverland}

% MAKETITLE
\setlength{\affilsep}{0pt}
\renewcommand\Affilfont{\itshape\small}

\makeatletter
\renewcommand{\maketitle}{\bgroup\setlength{\parindent}{0pt}
\begin{flushleft}
  {\huge\textbf{\@title}\par}

  \@author
\end{flushleft}\egroup
}
\let\AB@maketitle=\maketitle
\def\maketitle{{\renewenvironment{tabular}[2][]{\begin{flushleft}}
  {\end{flushleft}}
  \AB@maketitle}}
\makeatother