To switch between panels, orient the device in portrait mode to display
the Basic panel, or turn the device to the landscape mode to open the
Advanced panel
Enter a number and the arithmetic operation to be performed, enter the
second number, then touch "=" to display the result. Touch DEL to delete
digits one by one, long press DEL to delete all at one time.
If Settings\Display\When device is rotated\Rotate screen contents is
(1)
enabled, this item will display.
.
(1)
65