答案1
像这样?
\documentclass{book}
\usepackage{lipsum}
\usepackage{fancyhdr}
\usepackage[Lenny]{fncychap}
\usepackage{appendix}
\pagestyle{fancy}
\fancyhf{}
\renewcommand{\chaptermark}[1]{\markboth{\chaptername\ \thechapter.\ #1}{}}
\begin{document}
\chapter{A}
\begin{appendices}
\chapter{Title of this appendix}\label{apx:f}
\section{An appendix section}
\end{appendices}
\end{document}