[Galaxy Tab A 8.0] S Pen's side-button menu cannot be disabled on Marshmallow 6.0.1

[AC Question]

Now I am stuck with Air Command screen every time I press the pen's side button that could be disabled in earlier updates (tried removing all the commands and it still show). I used that button for drawing which is the main purpose I bought it for.

Do I have to flash the device to revert to Lollipop or is there any other way around to turn the nagging screen off?