The LabQuest 3 uses a capacitive touch screen that neither requires nor allows calibration.
Capacitive touch screens are commonly made of two layers (a surface insulator and a transparent conductive layer beneath it). Since the human body itself is an electrical conductor, when the touch panel is touched with a finger (or a conductive pen), the electrostatic field of the panel is distorted. The surface of the screen does not need pressure to register a touch. Nor does it deform as part of the process of registering a touch.
The original LabQuest and LabQuest 2 used a resistive-type touch screen. These screens require pressure on the screen to deform the top surface and make physical contact with the bottom layer. These screens occasionally require calibration to align the physical touch screen to the display behind the screen.
Capacitive screens are generally easier to use and respond more accurately than resistive touch screens, although capacitive screens are harder to use when wearing gloves.