If you are using UP BOX/UP BOX+. After the nozzle height detection is done, a popup dialog allows user to choose from the available build plates, or on the Maintenance interface, find Print Board to change the type to the desired value.
This option is only usable for UP BOX/UP BOX+ models.
This is because for UP BOX/UP BOX+ they have 2 kind of Print board that have difference thickness. So the effect of this setting is to adjust nozzle height value for different type of print board. The value is adjusted in the back end and not visible to user.
for other printer models, this option is not usable, as the thickness of their print boards are uniform and no need to adjust nozzle height value for different print boards.