Before the iPhone 6 came out, the earliest iPhones had the power button on the top, as depicted in the illustration on the right. Hence, users with iPhone 5s or older click the top power button and home button together to take a screenshot. After they take a screenshot, it appears as a thumbnail at the bottom right corner of the display.
Now, from the sixth generation of iPhones, Apple decided to move the power button to the right. Hence, if you own any of the iPhones from the iPhone 6, iPhone 7, or iPhone 8 series, you’d have to press the power button on the right and the home button. When Apple relocated the power button, users faced problems as they developed a habit of turning off their screen by pressing the top portion of the iPhone, but it was nothing compared to the removal of the home button, which doubled as the Touch ID.
The latest iPhone models, from the iPhone X released in 2018 to the iPhone 13 released in 2021, feature Apple’s face recognition technology called Face ID. On these models, there is no home button; hence, to click a screenshot, you have to press the volume up button on the phone’s left side and the power button on the right side of the phone (via Apple).