如何指定 Latex 文件中标题的字体大小？此外，目录页未显示“摘要”和“确认”

Question

% 我希望章节标题 {INTRO} 的字体为 16，节标题为 14，%subsection 为 12。

\documentclass[a4paper,12pt, twoside]{report}
    \usepackage[margin=1in]{geometry}
    \usepackage{titlesec}
     \titleformat{\chapter}[display]
     {\filcenter\normalfont\Large\bfseries}
     {\MakeUppercase{\chaptertitlename}\ \thechapter}
     {1pt}{\LARGE}
     {}
     \titlespacing*{\chapter}{0pt}{-0.6in}{0pt}

     \titlespacing*{\section}{0pt}{8pt}{16pt}

   \titlespacing*{\subsection}{0pt}{12pt}{12pt}

   \usepackage[utf8]{inputenc}

    \usepackage{graphicx}
    \renewcommand{\baselinestretch}{1.5}  

    \begin{document}
% Content starts
    \pagenumbering{roman}
    \input{Declaration}
    \input{Acknowledgements}
    \input{abstract}
    \tableofcontents
    \listoffigures
    \listoftables
    \input{Abbreviations}
    \pagenumbering{arabic}
    \input{Intro}
    \input{Review}


    \bibliography{References}
    %\bibliographystyle{spbasic} 
    \bibliographystyle{ieeetr}

\end{document}