Hello,
If I activate the immersion mode, how will it work?
Does the immersion mode with fan regulate normally?
This is correct, it will keep controlling the fans the same. (With Temperature control Auto or Manual).
This is actually just setting the minimum number of required fans to hash to 0, and was simply a cosmetic UI change. Older versions of the firmware had the actual 0 in the miner UI. Regardless, it does the exact same thing.