Hanging indentation of long section-level entries in the List of Appendices

Question

documentclass[a4paper,oneside,11pt]{book}
usepackage[left=4 cm,right=3cm,top=4cm,bottom=3cm]{geometry}
usepackage{amssymb}
usepackage{amsmath}
usepackage{lipsum}
usepackage{titlesec}

usepackage{tocloft}
% code for List of Appendices
newcommand{listappendicesname}{List of Appendices}
newlistof{appendix}{app}{listappendicesname}
% new command for appendix sections
newcommand{appsection}[1]{section{#1}%
    addcontentsline{app}{appendix}{Appendix protectnumberline{thesection}#1}par}

titleformat{chapter}
[display]
{centerbfseries}
{largeMakeUppercase{chaptertitlename} thechapter}{1pt}{large}
titlespacing{chapter}{0cm}{-1.2cm}{0.7cm}

titleformat{section}
[hang]
{bfseries}
{bfseriesthesection}{1ex}{bfseries}

usepackage{tocbasic}
DeclareTOCStyleEntry[
linefill=bfseriesTOCLineLeaderFill,
beforeskip=2pt,
entrynumberformat=chapterprefixintoc,
dynnumwidth
]{tocline}{chapter}

newcommand*chapterprefixintoc[1]
{MakeUppercase{chaptername}~#1enskip}

begin{document}
    frontmatter
    tableofcontents
    
    newpage
    % print list of appendices and add title to the ToC
    listofappendix addcontentsline{toc}{chapter}{listappendicesname}
    
    mainmatter
    chapter{ABC}
    section{First Section First Section First Section First Section First Section First Section First Section First Section}
    lipsum[1-2]
    section{Second Section Second Section Second Section Second Section Second Section Second Section Second Section Second Section }
    lipsum[3-4]
    
    chapter*{APPENDIX}
    setcounter{section}{0}
    renewcommand{thesection}{arabic{section}}
    titleformat{section}
    {normalfontLargebfseries}{Appendix~thesection.}{1em}{}
    %%%%%    addcontentsline{toc}{chapter}{APPENDICES} % don't add to ToC
    addtocontents{toc}{protectsetcounter{tocdepth}{0}} % No sections in ToC
    appsection{First Appendix First Appendix First Appendix First Appendix First Appendix }
    lipsum[4-4]
    
    appsection{Second Appendix Second Appendix Second Appendix Second Appendix Second Appendix }
    lipsum[3-3]
end{document}

I have make list of appendices and I want the long title of appendices is align as picture below. How to do that?

Mico · Accepted Answer

Since you employ the tocloft package for its newlistof macro, I believe it's useful to employ the package for issues related to the formatting of the table of contents and the list of appendices as well.
The following code does so; please let me know if you believe I missed or misunderstood your formatting objectives.

documentclass[a4paper,oneside,11pt]{book}
usepackage[left=4cm,right=3cm,top=4cm,bottom=3cm]{geometry}
usepackage{amssymb,amsmath}
usepackage{microtype} % <-- nice to have
usepackage{lipsum}

%% Formatting of chapter-level and section-level headers
usepackage{titlesec}
titlespacing{chapter}{0cm}{-1.2cm}{0.7cm}
titleformat{chapter}[display]%
    {centeringbfseries}%
    {largeMakeUppercase{chaptertitlename} thechapter}{1pt}{large}
titleformat{section}[hang]%
    {bfseries}%
    {bfseriesthesection}{1ex}{bfseries}

% New command 'appsection'
newcommand{appsection}[1]{section{#1}%
    addcontentsline{app}{appendix}{protectnumberline{thesection}#1}}

usepackage{tocloft}
% Code for chapter-level entries in TOC: use dot leaders, 
%   use "chapter" prefix for numbered chapters
renewcommand{cftchapleader}{cftdotfill{cftdotsep}}
renewcommand{cftchappresnum}{MakeUppercase{chaptername}space}
setlength{cftchapnumwidth}{8em}
renewcommand{cftchappagefont}{mdseries}
% Code for List of Appendices
newcommand{listappendicesname}{List of Appendices}
newlistof{appendix}{app}{listappendicesname}
renewcommand{cftappendixpresnum}{appendixnamespace}
setlength{cftappendixnumwidth}{6em}

begin{document}

frontmatter

tableofcontents  
newpage
listofappendix 
addcontentsline{toc}{chapter}{listappendicesname}

mainmatter

chapter{ABC}
    section{First Section First Section First Section First Section First Section 
             First Section First Section First Section}
    lipsum[1-2]
    section{Second Section Second Section Second Section Second Section Second 
             Section Second Section Second Section Second Section }
    lipsum[3-4]
    
chapter*{MakeUppercase{appendixname}}
    setcounter{section}{0}
    renewcommand{thesection}{arabic{section}}
    % Don't show appendix sections separately in the ToC:
    addtocontents{toc}{protectsetcounter{tocdepth}{0}} 
    titleformat{section}%
        {normalfontlargebfseries}%
        {appendixname~thesection.}{1em}{}
    
    appsection{First Appendix First Appendix First Appendix First Appendix First Appendix }
    lipsum[4]
    
    appsection{Second Appendix Second Appendix Second Appendix Second Appendix Second Appendix }
    lipsum[3]
    
end{document}

Hanging indentation of long section-level entries in the List of Appendices

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