The Touchscreen Calibration Tool can be accessed from the OV-Menu. It displays crosshair-cursors at three different locations, waits for user interaction with the finger or a stylus and creates a touchscreen calibration file. A touchscreen calibration is recommended in any case after the display orientation has been changed or the user input seems to be inaccurate. Do not forget to set the display rotation again (even if it is ok for you) after the touchscreen calibration to initiatete a persistent storage of the calibration data. A dirty screen may also require a recalibration (or cleanup)… Please keep in mind that the Touchscreen is optional. Touchscreen input is processed by libinput, a Linux library for input devices.
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