I want to edit header/footer of my document with the scrlayer-scrpage package. Here's the MWE:
\documentclass[english,BCOR=6mm,cdgeometry=twoside,DIV=12,open=right,headsepline]{tudscrbook}
\usepackage{babel}
\usepackage{isodate}
\usepackage{blindtext}
\usepackage{scrlayer-scrpage}
\begin{document}
\mainmatter
\blinddocument
\end{document}
I want header and footer to extend slightly beyond the text width. A similar question was asked yesterday (Adjust header and footer width) but there fancyhdr package is used which is not compatible with scrbook.
Edit: Also, I want to know how to format the chapter titles to look like: