For me thesis, I want to suppress all badbox message until it is somewhat finished to concentrate on the more pressing warnings. As suggest here https://tex.stackexchange.com/a/164889/81936 I tried using the silence package. This did not change anything. I guess because badbox is actually neither a warning nor an error.
As suggested here https://tex.stackexchange.com/a/50850/81936, I added
\hfuzz=10000pt
\vfuzz=10000pt
\hbadness=2000
\vbadness=\maxdimen
to my header. This also had no effect. The structure of my thesis looks like this
\documentclass[oneside,a4paper]{book}
\input{chapters/header}
\input{chapters/symbols}
%%BODY
\begin{document}
\include{chapters/preamble}
\mainmatter
%many chapters that throw badbox messages
\printbibliography[heading=bibintoc]
\appendix
\chapter{Appendix}
\include{chapters/appendix}
\end{document}
I set the \hfuzz stuff in the header.tex file.
Overfull \hbox (16.9164pt too wide) has occurred while \output is active \OT1/cmr/m/sl/10 CHAPTER 5. ADVANTAGES OF GAUSSIAN PROCESS PANEL MODELING \OT1 /cmr/m/n/10 35 []
andOverfull \hbox (200.03493pt too wide) in paragraph at lines 647--648 [][] []
\sloppy
or\fussy
both of which set\hfuzz
to less than 16.9pt.