For those who prefer using their Android phones with one hand but are having difficulty pulling this of on the Samsung Galaxy S5 then the TouchWiz has some features that can help you achieve this. To enable one-handed friendly features:
* Launch the Settings app on your Galaxy S5.
* Find One-handed Operation in the list and tap on it.
* Turn the toggle at the top right to On in order to enable One-handed operation.
* Now follow the directions on the screen in order to customize one handed operation to the size of your hand.
The one handed features supports both right and left handed people. If you're left handed then perform motions from the left side of the screen and if you're right handed, you can perform motions from the right side of the screen