In fact, what I need is:
- a simple calculator with 4 arithmetic operations
- large buttons
- large display digits
The steps is as follows:
(1) Remove the Functional Keypad by specifying the number of rows to zero:
(2) Specify a bigger Main Keyboard by specifying very large values of Width and Height:
(3) Last but not the least, download a LCD font and specify it in the main option page:
