Have you tried a full power off/on cycle?
Didn't happen to do this? --
How to Remove App Drawer on Galaxy S7 & S7 Edge | Android Tips
Where are you located? This feature wasn't included in US phones -
https://www.sammobile.com/2016/03/09/galaxy-s7-and-galaxy-s7-edge-dont-come-with-galaxy-labs-menu-in-the-us/
As far as accidentally deleting the widget / icon, all I did was delete it as you would any other widget. I just held it down and selected the "Remove" option.
I am using Nova launcher.
I am using Nova launcher.
That little tidbit of info would have got this solved a little quicker.