sidenotes package not working with oneside option in book

figure* is not designed for oneside option. You can do this patch for one side. This won't work for two side/don't do this for twoside.

 \documentclass[oneside]{scrbook} \usepackage{blindtext} \usepackage{sidenotes} \usepackage{mwe} \usepackage[showframe]{geometry} \geometry{paperwidth=170mm, paperheight=240mm, left=42pt, top=40pt, textwidth=280pt, marginparsep=20pt, marginparwidth=100pt, textheight=560pt, footskip=40pt} % \makeatletter %\renewcommand{\@sidenotes@adjust}{% % \checkoddpage% % \ifoddpage% % % % \else% % %\hspace{\@sidenotes@extrawidth}% %% this was originally there % \fi} %% %% or %% \let\@sidenotes@adjust\relax \makeatother \begin{document} % \begin{marginfigure}% \includegraphics[width=\marginparwidth]{example-image-a}% \caption{A small rectangle put in the margin.\label{rectangle}}% \end{marginfigure}% % \blindtext % \begin{figure*}[htbp] \includegraphics[height=180pt,width=400pt]{example-image-c}% \caption{An even larger rectangle. This is the widest figure option. Both, the text as well as the margin width are used for the diagram.} \label{rectangle3} \end{figure*} % \clearpage % \begin{marginfigure}% \includegraphics[width=\marginparwidth]{example-image-a}% \caption{A small rectangle put in the margin.\label{rectangle2}}% \end{marginfigure}% % \blindtext % \begin{figure*}[htbp] \includegraphics[height=180pt,width=400pt]{example-image-c}% \caption{An even larger rectangle. This is the widest figure option. Both, the text as well as the margin width are used for the diagram.} \label{rectangle31} \end{figure*} % \end{document}