What defines the width of the KMenu?

What defines the width of the KMenu? Or maybe I shoudl ask.. where is the width defined? My KMenu (in KDE3.2.1) is rather wide all of a sudden.. in fact it takes up almost half the screen when you click on the K (or SuSE icon). I've been poking around in $HOME/.kde/share but haven't accidently stumbled across anything that looks right yet. What makes this change? I don't see anything in the menu that woudl make it suddenly grow - the frequently used applications list is the same as it always is.. no long names there that might make things grow... C.