Sstrhsrtj

I am trying to create a multicolumn long table as shown below

I want to make first column wider; and reduce the width of column 2 and 4. Here is the latex file I tried. Please help me out.

documentclass[10pt,a4paper,landscape]{article}

usepackage[english]{babel}

usepackage[utf8x]{inputenc}

usepackage[T1]{fontenc}

usepackage{lmodern}

usepackage[nottoc]{tocbibind}

usepackage[margin=24mm,

        bottom= 5mm,%

        footskip=4baselineskip,

        includefoot,

        headheight=65pt

        ]{geometry}

usepackage{tikz}

usetikzlibrary{backgrounds, positioning, scopes}

tikzset{FOOT/.style = {

every node/.append style = {font=sffamilybfseries,

                        text=white,

                        align=center,

                        minimum height=15mm,

                        outer sep=0pt,

                        },

           sx/.style = {xshift=##1mm}

                    }

        }

usepackage{color,soul}

usepackage[usestackEOL]{stackengine}

usepackage{caption}

usepackage{placeins}

usepackage{subcaption}

usepackage{tcolorbox}

%The following package is used to write transpose of a matrix in nicer way

usepackage{amssymb}

%The following package is used to number items with alpha & roman

usepackage{enumitem}

usepackage{multirow}



% Set line spacing using the following package

usepackage{setspace}

usepackage{lastpage}

%% Useful packages

usepackage{amsmath}

% 

usepackage{ragged2e} % <---

usepackage{array, ltablex, makecell, multirow}

keepXColumns

renewcommandtheadfont{bfseries}

renewcommandtheadgape{}

newcolumntype{L}{>{RaggedRighthspace{0pt}}X}

newcolumntype{C}{>{Centering  arraybackslash}X}



usepackage{fancyhdr}

pagestyle{fancy}

fancyhf{}

renewcommand{headrulewidth}{2pt}



fancyhead[RO]{Personal Development Record}

fancyfoot{} % clear all footer fields



%%========================= Footer template ============================

fancyfoot[O]{% odd pages

begin{tikzpicture}[FOOT,

remember picture, overlay,

node distance=0pt]

node (O1) [minimum width=25mm,

        above right=of current page.south west]

        {};

node (O2) [minimum width=0.5textwidth, align=left,

        right=of O1]

        { Continuing Professional Development\

            footnotesize

          January 2019};

node (O3) [minimum width=0.5textwidth,

        align=center,

        right=of O2]

        { LarCoS\

            footnotesize

        Membership no. 123456qquad};

node (O4) [minimum width=25mm, font=sffamilybfseries,

        right=of O3]

        {thepage~of~pageref{LastPage}};

begin{scope}[on background layer]

fill[teal] (O1.south west) |- ([sx= 3] O3.north east)

                        -- ([sx=-3] O3.south east)

                         -- cycle;

fill[black] ([sx=-3] O2.south east) -- ([sx= 3] O2.north east) -|

        (O4.south east) -- cycle;

path[white, line width=1mm, shorten >=-0.5mm, shorten < =-0.5mm]

        ([sx=-3] O2.south east) edge ([sx=3] O2.north east)

        ([sx=-3] O4.south west) edge ([sx=3] O4.north west);

end{scope}

end{tikzpicture}

            } %odd page

%%%%==========================================

%%========================= Footer template ============================



begin{document}



begingroup

setcellgapes{5pt}

makegapedcells

setlengthtabcolsep{4pt}

small

begin{tabularx}{linewidth}{|L|c|c|c|*{3}{L|}>{raggedrightarraybackslash}p{6em}|}

hline

multicolumn{7}{|l|}{textbf{Job role and responsibilities:}}   \

 hline

multicolumn{4}{|c|}{textbf{Development Activity}}

& multicolumn{3}{c|}{textbf{Evaluation}}            \

hline

textbf{Details of CPD activity}

& textbf{Dates} & textbf{Effective learning time}

    & textbf{Dev. Plan ref.}

        & textbf{Key learning points}

            & textbf{Key benefits/value added}

                & textbf{Further comments: was the plan successful? How can I improve it in future??}\

hline

endfirsthead

hline

multicolumn{7}{|l|}{textbf{Job role and responsibilities (cont.):}}   \

hline

multicolumn{4}{|c|}{textbf{Development Activity}}

& multicolumn{3}{c|}{textbf{Evaluation}}            \

hline

textbf{Details of CPD activity}

& textbf{Dates} & textbf{Effective learning time}

    & textbf{Dev. Plan ref.}

        & textbf{Key learning points}

            & textbf{Key benefits/value added}

                & textbf{Further comments: was the plan successful? How can I improve it in future??}\

hline

endhead

multicolumn{7}{r}{textit{Continue to the next page:}}   \

endfoot

endlastfoot

 Study of structural detailing from design drawings and 'As built' drawings for several structures and its components from previous projects & makecell[tl]{Jul\2006\to\Sep\2006}

& 20~hrs

    & makecell[tl]{RB-\DAP-\01}

        &  From total structural arrangements to detail drawing of each components, welding and bolt symbols

            &  To visualize the structure as well as the connections, to understand the erection scheme from design drawing e.g. splice detail                              & I had successfully completed my action plan. I shall be able to improve it through continuous learning from my job responsibility  \

hline

&   &   &   &   &   &          \  hline

&   &   &   &   &   &           \  hline

&   &   &   &   &   &           \  hline



end{tabularx}

endgroup

end{document}