Notes, IIRC have two handwriting options, and the 'hover' one can be disabled (at least in stock it was). You have the handwriting option directly from the keyboard, summoned when you're using the keyboard app from the button next to the space bar. Then you have the 'hover' option, which only appears in fields configured as text fields (not all devs declare them as such so in some places that won't work, but the keyboard one will work whenever you have the keyboard open). That last option, I believe, could be disabled, just can't remember exactly where, if in S-Pen options or in Languages and Input. But I THINK it was there!