I don't have Always on Display on, I turned off Smart stay, and I have no idea how to keep it off. I have to press the lock screen button while my phone is docked and charging, or the screen will stay on. It heats up my phone and I don't like it. Has anyone found a way to keep the screen locked and off until you specifically press the lock screen to turn it on again?
Added (1). (Fast Charging)
Read more: How do you keep the lock screen off while charging? (Galaxy S8)?