
iOS 18 has turned out to have lots of fun small upgrades that Apple neglected to mention on-stage at WWDC. And one newly-discovered extra (via 9to5Mac) is a permanent power button, located in the redesigned Control Center.
As this screenshot from the iOS 18 beta shows, an off switch now dwells in the top right corner of Control Center, easily accessible when you swipe down from that corner of the phone to access the controls.