I have this feature on my Pinecil and it's annoying. Need to look into turning it off. I really just want to be in control of whether my iron is on (I'm working

I have this feature on my Pinecil and it's annoying. Need to look into turning it off. I really just want to be in control of whether my iron is on (I'm working with it) or off (I'm finished with it). Generally speaking I never want it off while it's plugged in.