I wanted to switch to our Cooking site in the handy dandy site switcher in the new top bar. Entering "cook" brings up nothing:
... so I have to remember that the boutique title of the site is "Seasoned Advice":
... in which case the site switcher also thinks that maybe I was thinking of heading over to Travel to see what's up. So the site switcher searches site names and descriptions, but not subdomains. This is unexpected behavior - I believe it should search all three.