Run 6s battery on 4s motor buid

hi guys it is running 4s battery with 4s motor and 6s ESC on my RAMBLER RS,but now I’m going to use 6s battery on my 4s buid ,but I don’t know how to limit the power in arduplane firmware ,I know limit the throttle in FBWA MODE by FWB_MAX_THROTTLE parameter ,but how to limit the throttle in manual mode ,I can also limit the throttle in manual mode by limiting the max servo output ,but doesn’t that affect the power of FWB_MAX_THROTTLE setting .