\documentclass[a4paper, 12pt]{report}

% This file is only for compiling your report, no need to edit it!

%%%%%%%%%%%%
% Packages %
%%%%%%%%%%%%

%\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage[noheader]{packages/sleek}
\usepackage{packages/sleek-title}
%\usepackage{packages/sleek-theorems}
%\usepackage{packages/sleek-listings}
\usepackage{packages/ie477}
\usepackage{xpatch}
\usepackage{blindtext}
\usepackage[explicit]{titlesec}
\usepackage{lipsum}
% This file is only for compiling your report, no need to edit it!
\usepackage{ragged2e}
\usepackage{tabularx}

%%% Chapter stuff
% centering
\titleformat{\chapter}[display]{\bfseries\centering}{\huge Chapter \thechapter}{1em}{\Huge #1}

% spacing
\titlespacing*{\chapter}{0pt}{-30pt}{10pt}
%% end chapter stuff

%%%%%%%%%%%%%%
% Title-page %
%%%%%%%%%%%%%%
% This file is only for compiling your report, no need to edit it!

\def\tbs{\textbackslash}

%%%%%%%%%%%%
% Document %
%%%%%%%%%%%%

\begin{document}
% This file is only for compiling your report, no need to edit it!

    %\maketitle
    
    %\include{prebooklet}
    
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    %%% GROUP BOOKLET REPORTS BEGIN %%
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    
    \addReport{ProjectReport}
    
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    %%%% GROUP BOOKLET REPORTS END %%%
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\end{document}
