Literature comparison table in Miktex using TexStudio

Question

How do I remove the horizontal 1st-row border, and secondly, how do I make the horizontal line borders bold? Also, any suggestion on moving the caption on the left and changing it in bold with some space between the table and the caption above would be the proper way to do it in scientific reports. Maybe something similar to this format style ... of course, color doesn't matter!

I also get an error if I use \resizebox{\textwidth}{!} to scale the table to the text width. The code is as follows:

\begin{document}
\begin{table}[]
        \caption{Literature Review}
        \label{tab:my-table}
        \resizebox{\textwidth}{!}{%
            \begin{tabular}{lllllll}
                \hline
                \rowcolor[HTML]{C0C0C0} 
                \textbf{Nr.} &
                \textbf{Study} &
                \textbf{Study Purpose} &
                \textbf{Methodology} &
                \textbf{\begin{tabular}[c]{@{}l@{}}Enviornmental Scale \\ \& Sample size\end{tabular}} &
                \textbf{Key Findings} &
                \textbf{Concolusions} \\ \hline
                &  &  &  &  &  &  \\ \hline
                &  &  &  &  &  &  \\ \hline
                &  &  &  &  &  &  \\ \hline
                &  &  &  &  &  &  \\ \hline
                &  &  &  &  &  &  \\ \hline
                &  &  &  &  &  &  \\ \hline
                &  &  &  &  &  &  \\ \hline
                &  &  &  &  &  &  \\ \hline
                &  &  &  &  &  &  \\ \hline
            \end{tabular}%
        }
    \end{table}
\end{document}

Output result without scaling the table to text width:

Answer 1

I have posted the new code. Regard row borders, it doesn't matter, as I had resolved in the previous code that I had posted earlier. The column's head with a long name doesn't show its full text (i.e., Environmental scale & sample size). I tried changing the column width, but it remains the same. Also, as you see from the picture in each column and row (each cell), the text length will vary, and in some cells, I intend to add a list or bullets inside the cell. The table is long. I want it role to next page with the same head and with foot saying "continuous to next page," But I don't know how to use \usepackage{longtable} inside the tabularx package unless there is a way to do it within `tabular package.

\documentclass{article}%
\usepackage{geometry}
\usepackage[table, svgnames]{xcolor}
\usepackage{tabularx, caption, makecell, booktabs,enumitem}
\renewcommand{\theadfont}{\bfseries\scriptsize}
\renewcommand{\theadalign}{bc}

\begin{document}
    
    \begin{table}[!ht]
    \captionsetup{singlelinecheck=false, font=small, labelfont=bf}
    \caption{Literature Review}
    \label{tab:my-table}
    \centering
    \renewcommand{\aboverulesep}{0pt}
    \renewcommand{\belowrulesep}{0pt}
    \setlength{\tabcolsep}{3.5pt}
    \renewcommand{\tabularxcolumn}[1]{>{\arraybackslash}m{#1}}
    \rowcolors{1}{Gainsboro}{}
    \begin{tabularx}{\linewidth}{l*{3}{>{\hsize=0.95\hsize}X}>{\hsize=1\hsize}X*{3}{>{\hsize=0.95\hsize}X}}
    \noalign{\vspace*{-2ex}} \toprule
    \thead[l]{Nr.} &
    \thead{Study} &
    \thead{Study's Purpose} &
    \thead{Methodology} &
    \thead{Environmental Scale \\ \& Sample size} &
    \thead{Key Findings} &
    \thead{Conclusions} \\ \midrule 
    
    1 & bla bla bla bla bla bla bla bla bla bla bla bla  & bla bla bla bla bla bla bla bla bla bla bla bla  & bla bla bla bla bla bla bla bla bla bla bla bla  & bla bla bla bla bla bla bla bla bla bla bla bla  & bla bla bla bla bla bla bla bla bla bla bla bla  & bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla  \\
    
    2 & bla bla bla bla bla bla bla bla bla bla bla bla  & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla \\
    
    3 & bla bla bla bla bla bla bla bla bla bla bla bla  & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla \\ 
    4 & bla bla bla bla bla bla bla bla bla bla bla bla  & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla \\
    
    5 & bla bla bla bla bla bla bla bla bla bla bla bla  & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & 
         \begin{itemize}
            \item 1st bla bla bla bla
            \item  2nd bla bla bla bla ba bla bla
        \end{itemize} \\
    
    6 & bla bla bla bla bla bla bla bla bla bla bla bla  & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla \\ 
    
    7 & bla bla bla bla bla bla bla bla bla bla bla bla  & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla \\
    
    8 & bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla  & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla \\
    
    9 & bla bla bla bla bla bla bla bla bla bla bla bla  & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla  \\
    
    10 & bla bla bla bla bla bla bla bla bla bla bla bla  & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla  \\
    
    11 & bla bla bla bla bla bla bla bla bla bla bla bla  & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla  \\ 
    
    12 & bla bla bla bla bla bla bla bla bla bla bla bla  & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla & bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla  \\ 
    
    \bottomrule
\end{tabularx}%
\end{table}

\end{document}