I started using bookdown to generate a longer report, but came into some touble as I wanted to customize the pdf output. \documentclass[]{}
does not work in the preamble.tex
file. I think that comand is somehow executed by pandoc beforhand, unfortunately I did not find out how to pass options to it so far.
I worked around a few things like setting the fontsize via \usepackage[12pt]{moresize}
but I was wondering how to acces the set up options properly. The bookdown documentation does not cover this subject in sufficient detail for me to understand.