How to change CPU fan setting in the BIOS of youyeeto X1 x86 SBC?

Keep pressing the ESC key until the BIOS appears.
Find the smart fan mode by the following steps and set values of what you expect to
Menu: Advanced——>Hardware Monitor——>Smart fan mode
PWM (Pulse Width Modulation) is a commonly used method of motor speed control. In fan startup, the PWM setting value determines the fan startup speed. For example,PWM values of 60 and 120 respectively represent different start-up speeds.

You can change the fan speed by adjusting Fan start PWM