New s7 edge questions

I use the same official Samsung Blsck leather case as per the pictures and it fits like a glove. Bought it from the official online Samsung Store.

I use TouchWizz.

I also use the stock Samsung Keyboard with it shrunk down so I can choose to have a clear space either on the left or right.

No accidental touches this way for me when typing.
 
Take it back then. It's supposed to snap into place.

I bought it online around 5 months ago from a foreign Samsung store (we don't have a Samsung store or an online one). Would have cost me too much in postage to return it, wasn't worth it. I got a clear Spigen Liquid Crystal that's pretty decent but it's gone rotten dirty.

It's not so much accidental touches for me anyway on the edges, it's that they're not as responsive as the rest of the screen. I often would have to press twice on a keyboard key if it's on the curve.
 
I use the Otterbox Defender Case; it provides good grip and protection. I also use Nova Launcher. Initially I had problems hitting the keys on the left side of the keyboard and the icons on the left side of the screen but it was related to the screen protector on my phone.