Casio IT-2000W Technical Reference Manual page 60

Note:
If an mark does not disappear and the arrow does not move to the next position even if the
mark has been touched by the stylus, an incorrect position was likely touched.
Touch the correct position.
Key Operation
1 key
2 key
Others
Adjusts the touch panel calibration starting from the beginning.
Returns to the menu screen.
Invalid
60
Function