Only hold down one of theVolumebuttons,UporDown.
APowerswitch should appear at the top of the screen labeledslide to power off.
Drag thePowericon from the left all the way to the right.

Your iPhone 15 Pro or Pro Max should turn off.
Heres how to perform an iPhone shutdown using iOS.
Scroll down to the bottom of the menu and selectShut Down.

Slide thePowerbutton from left to right.
All you oughta do is say either Hey, Siri.
Turn off my iPhone or Hey, Siri.
Shut down my iPhone and respond with Yes when asked to confirm your request.
Press theSidebutton or tap the screen to wake it up.