... Site-level preferences are located in TWiki.TWikiPreferences , however this Main.TWikiPreferences prefs topic has override priority and should be used for local customisations. This allows for easier upgrades as you don't need to worry about the shipped preferences clobbering yours. ... Quick edit of existing preferences (edit the topic text to set new preferences) . ... FINALPREFERENCES locks site-level preferences that are not allowed to be overridden by WebPreferences or user preferences: . ...