New PWM FAN configuration

Hey there!

Is there any beginner guide on working with PWM Fan (header) on latest Rock 5b debian img?
I saw this in the new documentation page for RSETUP > Hardware > Thermal Governor:

"
This module is used to adjust the fan and other temperature options.
Generally, we select power_allcator when using DC fan or fanless, select step_wise when using PWM fan.
Note: If you connect the fan directly to the GPIO on 5V and GND pins, it would not be controlled and allways work.
"

I just can not figure it out.

Thank you for all your help!