# Decrease spacing between a bullet point and its subbullet point

This is my code:

\documentclass[a4paper,10pt]{article}
\usepackage[top=0.75in, bottom=0.75in, left=0.55in, right=0.85in]{geometry}
\usepackage{graphicx}
\usepackage{url}
\usepackage{palatino}
\usepackage{tabularx}
\usepackage{enumitem}
\usepackage{pifont}

\begin{itemize}
\item \textbf{Cluster Middleware}
%%%%%%%%%%%%% Decrease space here %%%%%%%%%%%
\begin{itemize}
\item{Designed a cluster middleware for distributed processing and storage, being fault tolerant}
\end{itemize}
\end{itemize}

This is how it looks: Is there a way to change this spacing? Any help is greatly appreciated.

• Welcome to TeX.SE. Please tell us (a) which document class you employ and (b) whether you load packages, such as enumitem and enumerate, that can influence how itemize environments are displayed. – Mico Jul 6 '19 at 18:25
• @Mico I have added the info in the question, do tell me if there is anything else missing. – subtleseeker Jul 6 '19 at 18:45

The topsep length of the sub-itemization can be changed:

\documentclass[a4paper,10pt]{article}
\usepackage[top=0.75in, bottom=0.75in, left=0.55in, right=0.85in]{geometry}
\usepackage{graphicx}
\usepackage{url}
\usepackage{palatino}
\usepackage{tabularx}
\usepackage{enumitem}
\usepackage{pifont}

\begin{document}

\begin{itemize}
\item \textbf{Cluster Middleware}
%%%%%%%%%%%%% Decrease space here %%%%%%%%%%%
\begin{itemize}[topsep=-5pt]
\item{Designed a cluster middleware for distributed processing and storage, being fault tolerant}
\end{itemize}
\end{itemize}

\end{document}

If you mean decreasing the horizontal and the vertical spacing, here you are:

\documentclass[a4paper,10pt]{article}
\usepackage[top=0.75in, bottom=0.75in, left=0.55in, right=0.85in]{geometry}
\usepackage{graphicx}
\usepackage{url}
\usepackage{palatino}
\usepackage{tabularx}
\usepackage{textcomp}
\usepackage{enumitem}
\setlist[itemize]{leftmargin=*}
\setlist[itemize, 2]{label=$\circ$, wide= 0pt, nosep, itemsep=2pt}
\usepackage{pifont}

\begin{document}

\begin{itemize}

\item \textbf{Cluster Middleware}
%%%%%%%%%%%%% Decrease space here %%%%%%%%%%%
\begin{itemize}
\item Designed a cluster middleware for distributed processing and storage, being fault tolerant
\end{itemize}
\item \textbf{Park EZ}
\begin{itemize}
\item A smart parking appt which helps in finding and booking a parking spot.
\item Updates the user in real time about the status of the parking spot using ultrasonic sensors.
\end{itemize}
\end{itemize}

\end{document}