how do i enlarge the button on keyboard for samsung galaxy s4 mini phone

[AC Question]

Hi
I am trying to enlarge the keyboard buttons on samsung galaxy s4 mini
i need bigger buttons the sizes of the letters are too small to tap

 

[Sam_Gs7]

Follow Steps: 1) Tap the apps icon "On HomeScreen-Lower row last icon"
2)Tap settings icon: 3) Tap on Display: 4)Tap Font size: Tap the desired Font
(i.e small-Medium-Large) : 5) Press Home-key to return to HomeScreen