You may adjust the button size as desired:
If using the touch screen, increase the button size to make it easier to touch the buttons.
If using a mouse, decrease the button size to give you more free space on the screen.
Touch the Tools button on the main button bar. A drop-down menu appears.
Select System Configuration from the drop-down menu.
Touch this button at the top of the System Configuration window.
Use the up and down arrow buttons to increase or decrease the size of the buttons.
This image changes size as you change the button size. The smallest buttons are 52 x 52, the largest 72 x 72.