Configuración de margen para el título del capítulo y el número del capítulo

Question

Estoy usando el siguiente código. El margen de mi informe es de 2 cm para arriba, derecha e abajo, y 4 cm para la izquierda. La configuración de margen funciona para mi segunda página. Sin embargo, no funciona para mi página en la que se encuentra el título del capítulo. ¿Puedo saber cómo puedo solucionarlo? Además, necesito poner el título y el número de mi capítulo en la misma fila. Gracias por tu ayuda.

\documentclass[12pt,a4paper]{report}

%%%%%%%%Package
\usepackage{anysize}
\usepackage{faktor} 
\usepackage{placeins}
\usepackage{float}
\usepackage{fancyhdr}%for page number font
\usepackage{lmodern}%also for page number font

\usepackage{booktabs, calc, cleveref}

\usepackage{mathptmx}%Font: Times New Roman

\usepackage{setspace} %Set spacing between lines
\doublespacing

\usepackage[font={small},labelfont=bf]{caption}%For figure's caption
\usepackage[titles]{tocloft} %Table of contents 


\usepackage{sectsty}%used to format chapter title to be centre etc.
    \chapternumberfont{\nohang\centering\small\MakeUppercase} %to format the font for the 'Chapter' number
    \chaptertitlefont{\nohang\centering\small\MakeUppercase}
     \sectionfont{\fontsize{12}{15}\selectfont}



%Set Margin
\usepackage[left=4cm, right=2cm, top=2cm, bottom=2cm, footskip=1cm]{geometry}

%%%%%%%

\renewcommand{\cftchapleader}{\cftdotfill{\cftdotsep}} % for chapters dots
\renewcommand\cftchappresnum{CHAPTER } % prefix "Chapter " to chapter number in ToC
  \cftsetindents{chapter}{0em}{6em}      % set amount of indenting

\pagestyle{fancy}
  \lhead{}
  \chead{}
  \rhead{}
  \lfoot{}
  \cfoot{}
  \rfoot{\thepage}

 \fancypagestyle{plain}{
    \fancyfoot{}
    \fancyfoot[R]{\fontsize{10pt}{10pt}\selectfont\thepage}
    \renewcommand{\headrulewidth}{0pt}
    \renewcommand{\footrulewidth}{0pt}}
 \pagestyle{plain}

\begin{document}

\chapter{Introduction}
 This is my file.

\newpage
This is my file2.


\end{document}

Answer 1

\documentclass[12pt,a4paper]{report}


%%%%%%%%Package
\usepackage{array}

\usepackage{anysize}
\usepackage{faktor} 
\usepackage{placeins}
\usepackage{float}

\usepackage{enumerate}
\usepackage{fancyhdr}%for page number font
\usepackage{lmodern}%also for page number font
\usepackage[pdftex]{graphicx}
\usepackage{caption}


%Set Margin
\usepackage[left=4cm, right=2cm, top=2cm, bottom=2cm, footskip=1cm, showframe]{geometry}

\usepackage{mathptmx}%Font: Times New Roman


\usepackage{setspace}%double spacing
  \setstretch{2}%or use \doublespacing

\usepackage[font={small},labelfont=bf]{caption}
\usepackage[titles]{tocloft}

\usepackage[notquote]{hanging}%for hanging indentation, used in the List of Publications section, [notquote] required so file doesn't crash

\usepackage{titlesec}%used to format chapter title to be centre and within margin.
   \titleformat{\chapter}[hang]{\bf}{\centering\normalsize\MakeUppercase\chaptername~\thechapter}{1ex}{\centering\MakeUppercase\normalsize}
   \titlespacing{\chapter}{0cm}{*-6}{*6}
   \titleformat{\section}{\normalfont\fontsize{12}{15}\bfseries}{\thesection}{1em}{}


\usepackage{tikz}

%%%%%%%

\renewcommand{\cftchapleader}{\cftdotfill{\cftdotsep}} % for chapters dots
\renewcommand\cftchappresnum{CHAPTER } % prefix "Chapter " to chapter number in ToC
  \cftsetindents{chapter}{0em}{6em}      % set amount of indenting

\pagestyle{fancy}
 \lhead{}
 \chead{}
 \rhead{}
 \lfoot{}
 \cfoot{}
 \rfoot{\thepage}
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}

%%%%
\fancypagestyle{plain}{
\fancyfoot{}
\fancyfoot[R]{\fontsize{10pt}{10pt}\selectfont\thepage}
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}}
\pagestyle{plain}


%%%%

\renewcommand{\contentsname}{Table of Contents}%Change 'Contents' to 'Table of Contents'




\begin{document}

\addcontentsline{toc}{chapter}{TABLE OF CONTENTS}

\tableofcontents

\pagenumbering{arabic} 
\setcounter{page}{1}


 %Chapter 1
 \chapter{\MakeUppercase{INTRODUCTION}}

 %Background of study
 \section{Background of study}

 xxx


 %%%%%%%%%%%%%%

 \chapter{\MakeUppercase{Literature Review and Some Preliminaries}}


 \section{A brief overview}

 xxx




 \end{document}