[Android Central Question]

What setting do I go to to get back my original keyboard that came with the Note 4

[Rukbat]

As opposed to? If the "original" keyboard is still on the phone, look for a little keyboard symbol when you have the keyboard showing and tap it - then you'll be able to switch to whatever input methods there are installed in the phone.

If it updated and you want the older version, you're going to have to find an .apk file of the old one - probably from someone who didn't update theirs.