@cooperdozier That is just pressing F11, technically. On most laptops and many multimedia keyboards, the mulrimedia functions are primary and the actual F-keys require you press and hold an Fn key to access the F-key functions. So Fn+F5 is F5 (Reload), Fn+F1 is Help, and yes Fn+F11 is Toggle Fullscreen.
Or - at least on my keyboard, you can press Shift+Fn to engage Fn Lock, which makes the F-keys primary and makes you use Fn to access the multimedia keys.