How to remove chapter indentation in table of contents

Question

First post so please be gentle :)

I'm relatively new to Latex but have managed to bumble my way through using package manuals and stack exchange. But now I'm stuck on something I'm not sure how to solve... I've added in a code section that removes 'chapter' from the headings and contents, but not the contents seem to have this weird indent. How do I get rid of this indent?

Here is a picture:

The preamble is as follows:

\documentclass[a4paper, 11pt, oneside]{book}
% Include any additional packages
\usepackage[left=3cm, right=3cm, bottom=3.5cm, top=3.5cm]{geometry}
\usepackage[font=footnotesize, center]{caption}                                             % Changes font size of figure captions to small
\usepackage[
    backend=biber,
    style=authoryear-comp,
    natbib=true,
    maxnames=2,
    sorting=nyt,
    sortcites=false,
    block=space,
    date=long,
    url=false, 
    doi=false,
    eprint=false,
    isbn=false,
    uniquename=false,
    uniquelist=false,
    terseinits=true,
    firstinits=false
    ]{biblatex}
\addbibresource{../../BibTex/library.bib}
%Put initials after names...
\DeclareNameAlias{sortname}{last-first}
\DeclareNameAlias{default}{last-first}    
%Remove "and" before last name. However, this also removes "and" in a textcite...
\renewcommand*{\finalnamedelim}{\addcomma\space}
\usepackage{fancyhdr}  
\usepackage{graphicx}   
\usepackage{wrapfig}
\usepackage{sidecap}                                
\usepackage{subfig} 
\usepackage[big,compact]{titlesec}
\usepackage[hidelinks]{hyperref}
\hypersetup{
    pdftitle=Report,
        pdfauthor=EL,
        pdfkeywords=Thesis
        }
\usepackage[printonlyused]{acronym} % Automates the generation of an acronyms list
\makeindex
\renewcommand{\baselinestretch}{1.5}% Set document line spacing to 1.5
\setlength{\parindent}{0in}
\renewcommand{\chaptername}{}
\renewcommand{\thechapter}{}
\newcommand{\comment}[1]{}

Answer 1

If you want unnumbered chapters, just say

\setcounter{secnumdepth}{-1}

instead of clearing \chaptername and \thechapter.

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By the way, setting \baselinestretch and \parindent is better done with the setspace and parskip packages. Of course my advice is to use neither increased baseline skip nor zero indentation: both hinder legibility.