There are more than 500 variables that can be used to customize
Org. For the sake of compactness of the manual, I am not
describing the variables here. A structured overview of customization
variables is available with M-x org-customize RET. Or select
Browse Org Group from the
Org->Customization menu. Many
settings can also be activated on a per-file basis, by putting special
lines into the buffer (see In-buffer settings).