How can I remove lines on edge?

[mapodev]

Hey, how can I remove the line of chapter decoration on top? I need only white space on edges of my script for Amazon publishing. You know what I mean?

[AlexanderZeilmann]

Do you mean this line at the beginning of chapters?

Or the line in the header of each page?

Or both? Or an entirely different line?

[fmarotta]

To remove the first one mentioned by AlexanderZeilmann, add this to the preamble of your main.tex

\makeatletter
\RenewDocumentCommand{\chapterstylekao}{}{%
    \renewcommand*{\chapterformat}{%
        \mbox{\chapappifchapterprefix{\nobreakspace}\scalebox{2.85}{\thechapter\autodot}}%
    }%  
    \renewcommand\chapterlinesformat[3]{%
        \vspace{3.5\vscale}%
        \if@twoside%
            \Ifthispageodd{%
                \smash{\makebox[0pt][l]{%
                    \parbox[b]{\textwidth}{\flushright{##3}}%
                    %\makebox[\marginparsep][c]{\rule[-2\vscale]{1pt}{27.4\vscale+\f@size mm}}%
                    \makebox[\marginparsep][c]{}%
                    \parbox[b]{\marginparwidth}{##2}%
                }}%
            }{
                \smash{\makebox[\textwidth][r]{%
                    \parbox[b]{\marginparwidth}{\flushright{##2}}%
                    \makebox[\marginparsep][c]{}%
                    \parbox[b]{\textwidth}{\flushleft{##3}}%
                }}%
            }
        \else%
            \smash{\makebox[0pt][l]{%
                \parbox[b]{\textwidth}{\flushright{##3}}%
                \makebox[\marginparsep][c]{}%
                \parbox[b]{\marginparwidth}{##2}%
            }}%
        \fi%
    }%  
    \RedeclareSectionCommand[beforeskip=0cm,afterskip=10\vscale]{chapter}%
    \setlength{\mtocshift}{-3\vscale}%
}
\makeatother

To remove the second one, add the following:

\makeatletter
\renewpagestyle{scrheadings}{%
    {\smash{\hspace{-\headmarginparwidth}\hspace{-\headmarginparsep}\makebox[\headtotal][l]{%
        \makebox[7\hscale][r]{\thepage}%
        \makebox[3\hscale]{}\makebox[3\hscale]{}%
        \makebox[\headtextwidth][l]{\leftmark}}}}%
    {\smash{\makebox[0pt][l]{\makebox[\headtotal][r]{%
        \makebox[\headtextwidth][r]{\hfill\rightmark}%
        \makebox[3\hscale]{}\makebox[3\hscale]{}%
        \makebox[7\hscale][l]{\thepage}}}}}%
    {\smash{\makebox[0pt][l]{\makebox[\headtotal][r]{%
        \makebox[\headtextwidth][r]{\hfill\rightmark}%
        \makebox[3\hscale]{}\makebox[3\hscale]{}%
        \makebox[7\hscale][l]{\thepage}}}}}%
}{%
    {}%
    {}%
    {}%
}
\makeatother

(You can also add both at the same time.)