I can't find step/mm setting

Recently a printout gave an error and the y-axis belt was damaged, I replaced the belt but now the y-axis is misaligned, every 20mm I get a 1mm error and I want to adjust this on the printer, but I can’t find where to configure it.

I don’t know the setting but can you confirm that the belt is the correct Creality spare part? I have replaced my Y belt and it has been totally fine.