The heated bed and the PEI glass plate on it are the basis for the formation of prints. By leveling the heated bed, you can ensure that the print adheres smoothly to the PEI glass plate.
Tap Calibration > Heated Bed Leveling > Start.
Follow the prompts on the Touchscreen, rotate the leveling wheel at the bottom of the heated bed to calibrate the Z-axis offset of the left extruder at two points on the heated bed.