Everyone loves mysterious switches, right?
If you scroll down to the bottom of this page, there's a Misc link. Click the link and you'll arrive at a Miscellaneous Options screen. That screen has a Save button.
Click the button and you'll be informed that "Option(s) Changed."
So, if you don't like the options life hands you, visit use.perl.org, eh?
Acutally, I didn't notice my options changing. Maybe I changed someone else's options? "Sorry" or "Your welcome", as appropriate.