Control line space between an itemize list and next line

Question

I am unable to control the line spacing between the last line of itemize and the next line as shown in the figure. Can someone suggest a solution to fix this please? I also would like to know if I can get more compact list.

\documentclass[10pt,a4paper,oneside]{article}
\usepackage[a4paper,left=0.9in,right=0.9in,top=1in,bottom=1in]{geometry}
\usepackage{longtable}
\usepackage{enumitem}

\renewcommand{\familydefault}{\sfdefault}


\begin{document}

    \scriptsize
    \begin{minipage}[t]{0.5\textwidth}
        \begin{longtable}[t]{|p{1.0cm}|p{5.5cm}|}
            \hline
            \bf{Head 1} & \textbf{Head 2} \\\hline\hline 
            \texttt{A} & Department 
            \begin{itemize} \setlength{\itemsep}{0pt}
                \item \texttt{A} - Apple
                \item \texttt{B} - Boy
                \item \texttt{C} - Cat
                \item \texttt{D} - Dog
            \end{itemize}\\
            \texttt{E} &  Elephant \\   
            \texttt{F} &  Fan \\   
            \hline
        \end{longtable}
    \end{minipage}%

\end{document}

Answer 1

If you load the enumitem package, then you can set options for lists (single or multiple of them), including the command you need which is after=. For example, if you write after=\vspace{\baselineskip}, that's what will happen after the list.

If you want a more compact list, you can also use negative values, like itemsep=-1mm. In any case, check how I used these commands, because the way you used is not the standard one. To align the longtable to the left, add the optional argument [l].

Also, make sure you check your code, you have a lot of \[\] where they shouldn't be, maybe a result of search and replace.

Output

Code

\documentclass[10pt,a4paper,oneside]{article}
\usepackage[a4paper,left=0.9in,right=0.9in,top=1in,bottom=1in]{geometry}
\usepackage{longtable}
\usepackage{enumitem}

\renewcommand{\familydefault}{\sfdefault}

\begin{document}
\scriptsize
%\begin{minipage}[t]{0.5\textwidth}
    \begin{longtable}[l]{|p{1.0cm}|p{5.5cm}|}
        \hline
        \bf{Head 1} & \textbf{Head 2} \\\hline\hline 
        \texttt{A} & Department 
            \begin{itemize}[itemsep=0pt, after=\vspace{-1ex}]
                \item \texttt{A} - Apple
                \item \texttt{B} - Boy
                \item \texttt{C} - Cat
                \item \texttt{D} - Dog
            \end{itemize}\\
        \texttt{E} &  Elephant \\   
        \texttt{F} &  Fan \\   
        \hline
    \end{longtable}
%\end{minipage}%
\end{document}

Answer 2

I do not know what is requestes behind of this table design, however, I will design as follows:

\documentclass[10pt,a4paper,oneside]{article}
\usepackage[a4paper,hmargin=0.9in, vmargin=1in]{geometry}
\usepackage{tabularx}
\usepackage{enumitem}

\renewcommand{\familydefault}{\sfdefault}

\begin{document}
\renewcommand\arraystretch{1.2}
    \begin{tabularx}{0.5\textwidth}{|>{\ttfamily}c|>{\ttfamily}X|}
        \hline
\textbf{\textsf{Head 1}} & \textbf{\textsf{Head 2}} \\\hline\hline
        A & Department
            \begin{itemize}[wide = 0.5em, nosep, after=\vspace{-\baselineskip}]
                \item A - Apple
                \item B - Boy
                \item C - Cat
                \item D - Dog
            \end{itemize}\\
        E & Elephant \\
        F & Fan \\
        \hline
    \end{tabularx}
\end{document}

i.e. without minipages, with use of tabularx, which span table to desired width and define font family in column options. This make code more concise and less prone for errors. Above MWE gives:

Addendum: If you for columns head use thead macro from makecell package, you can obtain:

The needed changes of above MWE are:

\usepackage{makecell,tabularx}
\renewcommand\theadfont{\bfseries\sffamily}
\usepackage{enumitem}

\renewcommand{\familydefault}{\sfdefault}

\begin{document}
\renewcommand\arraystretch{1.2}
    \begin{tabularx}{0.5\textwidth}{|>{\ttfamily}c|>{\ttfamily}X|}
        \hline
\thead{Head 1} & \thead{Head 2} \\\hline\hline
... <further is the same as in above MWE > ...

Answer 3

Two variations on the layout. I reduced the indent of the list and the vertical spacing w.r.t. the surrounding text.

Note an optional argument to a command or an environment, has be delimited by a pair of brackets ([option]), not between a pair of bracket commands (\[option\]). Also font commands such as \bf have been deprecated for more than 20 years. Use the \textbf{…} command instead or the \bfseries switch.

Last, not least, as @Zarko pointed, a long table is made to break across pages, and a minipage cannot. You can use the multicols environment instead.

\documentclass[10pt,a4paper,oneside]{article}
\usepackage[a4paper,hmargin=0.9in, vmargin=1in]{geometry}
\usepackage{longtable}
\usepackage{enumitem}

\renewcommand{\familydefault}{\sfdefault}

\begin{document}
\scriptsize
\begin{minipage}[t]{0.5\textwidth}
\renewcommand\arraystretch{1.33}
    \begin{longtable}[t]{|p{1.0cm}|p{5.5cm}|}
        \hline
        \textbf{Head 1} & \textbf{Head 2} \\\hline\hline
        \texttt{A} & Department
            \begin{itemize}[wide = 0.5em, nosep, after=\vspace{-\baselineskip}]
                \item \texttt{A} - Apple
                \item \texttt{B} - Boy
                \item \texttt{C} - Cat
                \item \texttt{D} - Dog
            \end{itemize}\\
        \texttt{E} & Elephant \\
        \texttt{F} & Fan \\
        \hline
    \end{longtable}
\end{minipage}%

\begin{minipage}[t]{0.5\textwidth}
\renewcommand\arraystretch{1.33}
    \begin{longtable}[t]{|c|p{5.5cm}|}
        \hline
        \textbf{Head 1} & \textbf{Head 2} \\\hline\hline
        \texttt{A} & Department
            \begin{itemize}[wide = 0.5em, nosep, after=\vspace{-\baselineskip}]
                \item \texttt{A} - Apple
                \item \texttt{B} - Boy
                \item \texttt{C} - Cat
                \item \texttt{D} - Dog
            \end{itemize}\\
        \texttt{E} & Elephant \\
        \texttt{F} & Fan \\
        \hline
    \end{longtable}
\end{minipage}%
\end{document}