Properly calibrating and fitting your device is essential for prolonged use of your Magic Leap 2. Fitting and calibration can be accessed from either the "Custom Fit" app on your device's home screen, or by opening the Perception menu (the headset icon in the lower-left of the home screen) and selecting "Custom Fit".
You will be walked through the fit of your device, followed by eye tracking. You will need to have the fit kit included with your Magic Leap 2, as well as the overhead strap nearby in case those are needed to find the proper fit.