So far the button assignment is limited to mostly Samsung apps. What gives!!
Please make it so we can assign the hardware buttons to any app we want!!!!! In my case, I need that Google/Android Pay be assigned to the lower button, thus replacing Samsung Pay. Can this be done?
Solved! Go to Solution.
Apparently, there's a more-or-less "hidden" setting where button re-assignment can be made: Settings/Advanced Features/Customize Keys. That does it.