It’s in Service not Initial Settings on mine. It’s definitely there for me. It’s also shown in the instruction manual. I’m pretty sure mine is an FTC5.
However, I’m still not entirely sure what the underexplained settings do in practice!
I don’t remember whether “Quiet mode” is among them on the FTC5.
Him? He’s a damned nuisance because he keeps popping up in my search results when I’m trying to figure out how these heat pumps work!