Well, In the open Sample Editor when I right click over the sample (wave) it's at the bottom of the list -- In Preferences/Editing/Tools "Pop-up toolbox on Right Click" is off = no tick
I noticed it while searching for the now non existent grid for Free Warp.
Ah..! Interesting; I just went to look again after reading your reply - yep, its there. Nice.
(and of course, if you hold down CTRL key whilst right-clicking - with 'toolbox popup' enabled in preferences - you get the full menu context list, with the 'Show Half-Levels' item right at the bottom).
(oh, and the grid for FreeWarp, we are told, is definitely coming back in the 7.5.20 update due around April..!) ;)