How to remove the white spaces from the beginning of Abstract title?

Question

I am using \documentclass[11pt,a4paper,twoside]{article} for my document. I want to remove the small space just before the "Abstract." title. How to remove that small space? I want to strat the "Abstract." title just like "Keywords" without any white spaces at begining.

Here is the screenshot:

I am using the following in my preamble:

\usepackage[runin]{abstract} % Allows abstract customization
\renewcommand{\abstractnamefont}{\normalfont\bfseries} % Set the "Abstract" text to bold
\renewcommand{\abstracttextfont}{\normalfont\small} % Set the abstract itself to small italic text
\abslabeldelim{.}

In the main.tex I am using:

\begin{abstract}
    \input{sections/abstract}
\noindent\textbf{Keywords.} \pdfKeywords\par

\end{abstract}
\vspace{0.5cm}

Answer 1

You can use \abstitleskip setting it to -\parindent.

You also want to apply \small to the title.

\documentclass{article}
\usepackage[runin]{abstract} % Allows abstract customization
\usepackage{lipsum}% mock text
\renewcommand{\abstractnamefont}{\normalfont\small\bfseries} % Set the "Abstract" text to bold
\renewcommand{\abstracttextfont}{\normalfont\small} % Set the abstract itself to small italic text
\abslabeldelim{.}
\setlength{\abstitleskip}{-\parindent}
\begin{document}
\title{Title}
\author{Sigma}
\date{}
\maketitle
\begin{abstract}
\lipsum[1][1-3]
\smallskip
\noindent\textbf{Keywords.} Pizza, without, pineapple.
\end{abstract}
\end{document}

A small skip between the abstract and the keywords seems necessary.

Answer 2

What do think about this solution?

\documentclass[11pt,a4paper,twoside]{article}
\usepackage{changepage}
\usepackage{lipsum}
\usepackage{fontspec}
\renewcommand{\sfdefault}{phv}
\begin{document}
\begin{adjustwidth}{1cm}{1cm} %By setting the dimensions you can choose how small or wide the abstract text should appear
\fontsize{12}{9}\selectfont \textbf{Abstract.} \lipsum[1] %or any other text
%\fontsize: first number changes the size of the font and the second number changes the leading. Set it to the desired numbers.
\noindent \textbf{Keywords.} First keyword, second keyword, third keyword,...
\end{adjustwidth}
\section{Introduction}
\fontsize{15}{18}\selectfont \fontfamily{ccr}\selectfont %change the font code as detailed here: https://tex.stackexchange.com/questions/426279/fontfamily-selectfont-does-not-work-with-xelatex-engine, for the rest see above
\lipsum[2-3]
\end{document}