Turns out it's pretty simple: just turn off wrapping (Format>Word Wrap). Doh! I've missed it for years, so am passing it along.
I know some will want to jump in and say "why are you using NotePad anyway?" Please save the smart remarks (and let's see if someone skips reading this and comments anyway).
But there are times when one may find themselves working on a Windows server where perhaps they're not free to install an alternative editor, or perhaps they just need to view/edit one file quickly so don't want to bother.
For those folks, I hope the tip above may help.