Its quite hard to use your Samsung S/Note series with one hand. As the screen becomes bigger and being edge-to-edge. I highly recommend you guys to try this apps called "ONE HAND OPERATION +" which you can get on Galaxy Store. It enhanced the fullscreen experience on your phone by eliminating Navigation Bar, and you can customise each gesture, just like what I did! You literally can customise everything from the trigger to the action you want to make.
Have a try !
