Custom Printer nozzle widths and triple extruder

Hello there, I’m new both here and to the program, I created 2 new printers xml.
On 1 of them i use a 0.5mm and I can’t select it, the program only choses 0.4mm nozzle.
On the other one, I have 3 extruders and I can’t find a way to make the program to only 3 extruders and not 4 like prusa.

I would sugest to add every nozzle you have on program to every printer, or a changeable option, also I have 0.25mm nozzles to use, and they are not there.

Thank You