I have the same problem, after a year my fan has started to make an exaggerated noise.
I don’t know if you have to change any option in the BIOS about the fan, although it seems that the options are for decoration.
This user has physically deactivated it (beware, the warranty is lost) It seems a good solution in the absence of official solutions from CHUWI, taking into account that it does not reach very high temperatures.
https://forum.chuwi.com/t/gemibook-pro-14-right-mouse-click-on-touchpad-isn-t-working-and-the-fan-is-running-on-full-speed/17571/12