Pat Schaefer wrote:
I never saw a screen like that before
so it turns the security update on
how then does the IOS update get turned on too?
That is the confirmation screen following any iOS update to let you know the update was successful. Like most users, you probably just clicked continue without reading any of the information on that screen. It will turn on both Security Updates AND iOS Updates after the install and like the screen says, it is up to you to go into Settings and turn those off. That will prevent a future iOS update. I do suspect at one time you did turn it Off, but a manual update was performed that turned it back on and were unaware that happened as stated in the update confirmation screen.
The iOS update is the version number like 18.6 and if a Security Update is applied, it will be followed by a letter as seen in the example provided in the link. That could look something like 18.6 (a).