I am using roughly the following setup
\documentclass[11pt]{book}
\usepackage{hyperref}
\usepackage[bf]{caption}
\usepackage{subcaption}
\usepackage{amssymb}
\usepackage[fleqn]{amsmath,mathtools}
\usepackage{fancyhdr}
\usepackage[Lenny]{fncychap}
\begin{document}
*some stuff*
\mainmatter
\input{Chapters/Chapter1}
etc.
\end{document}
I think the "Lenny" chapter style looks really nice. I would only like to change one minor detail: the title of the chapter is not printed boldfaced. For every chapter it is easy to change this: I simply write \chapter{{\bf TITLE}}. However, I would also like to have this for the Table of Contents and "Symbols" pages. How to do this?



\bf- burn that book. Commands like\bfhave been deprecated since the release of LaTeX2e, which was in 1994! See http://tex.stackexchange.com/q/15361/5763. – Martin Schröder Mar 30 '17 at 22:34fncychapuses those commands a lot (according to both manual, sources, and my experiments), in gems like\Huge\bfseries\rm(used by theLennystyle for the chapter title), so that bold essentially never works. (In fact, actually using bold makes IMHO most provided designs worse). On the other hand, at the start of fncychap's manual, the author admits he's no expert and asks for feedback. – Blaisorblade Aug 14 '17 at 16:49