One-Hand Mode
Enable mini screen view or the shifting keyboard to make it easier to use your device with one hand.
1. Open 
Settings.
2. Touch Smart assistance > One-handed UI. You can:
– Shrink the screen: Switch on Mini screen view. The mini screen view will display texts and images in smaller sizes for easier operation. You can switch between mini screen and normal screen by swiping left or right on the virtual navigation bar.
– Enable the shifting keyboard: Switch on Shifting keyboard. The dialer, in-call menu, and lock screen dialpad will shrink to the corner of the screen for easier one-handed typing. Touch the arrow next to the keyboard to move the keyboard to the other side of the screen.