\documentclass[
%draft%     uncomment to activate draft mode (see preamble/proofs)
]{scrbook}   
% preamble -- do not rearrange order of \includes
\include{preamble/classoptions}
\include{preamble/pagesize}
\include{preamble/packages}
\include{preamble/encoding}         
\include{preamble/fonts}
\include{preamble/ToC}
\include{preamble/contributor}
\include{preamble/copyright}
\include{preamble/bibtex}
\include{preamble/environments}
\include{preamble/sectionoptions}
\include{preamble/headerfooter}
\include{preamble/footnoteformat}
\include{preamble/codesnipets}
\include{preamble/proofs}     
% define issue details
\newcommand\thejournal{My Journal}
\newcommand\thejournalsubtitle{A LaTeX Template for a Journal in the Humanities}
\newcommand\thevolume{1}
\newcommand\theseason{Autumn}
\newcommand\theyear{2019}
\newcommand\theissue{\thejournal \ \thevolume \ (\theyear)} 
\newcommand\generaleditor{Jane Doe}
\newcommand\associateeditor{John Doe}
\sloppy
\newcommand\thewebsite{https://my.journal.org}
\begin{document}
\sloppy                         % preferences more space between words over overrunning margins
\lefthyphenmin=3                % suppresses hyphenation after only 1 or 2 characters
                                % NB: You will need to repeat \lefthyphenmin in the text if you use \selectlanguage
\include{front/editorialboard}
\include{front/titlepage}
\include{front/colofon}
\pagenumbering{roman}           
\tableofcontents  
\thispagestyle{empty}
% \include{essays/preface}
\pagenumbering{arabic}
\part{Essays}
\include{essays/my-essay}
\include{essays/martinez}   
\include{essays/empty-template}
\part{Reviews}
\include{reviews/my-review}
\include{reviews/example-template}
\appendix
\include{back/licence-agreement-template}
\include{back/authors}
\end{document}