Changing nozzle size in Creality Print

How do you change nozzle size in Creality Print? I tried to manually create a new printer with the new size of 0.6 mm in the K1. However, it then won’t let me add different materials.

If you go to the manage printers tab, and then go to ‘extrusion 1’ there is an option there to set the nozzle diameter. That is the way i always do it!