Final answer:
To turn off the screen of an iPhone 15 Pro Max, you can either press the power button on the side of the device or go to the settings and shut down the entire device.
Step-by-step explanation:
To turn off the screen of an iPhone 15 Pro Max, you can simply press the power button located on the right side of the device. Pressing and holding the power button for a few seconds will bring up the power options menu, where you can choose to turn off the screen.
If you want to completely power off the iPhone 15 Pro Max, you can also go to the Settings app, select 'General,' then scroll down and tap on 'Shut Down.' This will shut down the entire device, including the screen.