Ok, I just tried the long press and it didn't do anything, except lower that one seat by one level.
However, the car is in the sun right now and interior is fairly warm and the seats didn't automatically come on.
I manually turned them all on, and then tried the long press off and got nothing.
I'll try it next time they all automatically come on. I also couldn't find any tips. Perhaps they popped up once and I never read it carefully.
I'm on an iPhone BTW.