I am writing my thesis using a template provided by the university. It requires using the report class. To format the headings in the front matter, it uses the
titlesec package and redefine the format (
\titlespacing). However, this also changes the format of chapter headings in the main matter, which I don't like. I have tried using
\newenvironment to define an environment
preliminary to wrap the front matter and to only redefine the headings' format locally. However it did not work.
My questions are: is it possible to change the headings' format locally? if not, how to save the default format and restore it after the front matter?
I guess I can always redefine the format after the front matter, but I want to keep the default.