Taking a screenshot is a core feature of any smartphone, and usually one that’s easy to do. On the Galaxy Note 10, however, taking a screenshot is a bit different compared to other Android devices.
Here’s how it works:
Quickly press the volume down button + side button together
and release right after
Why quickly? Because on the regular Android phones, taking a screenshot is as easy as long-pressing the power and volume down buttons. However, since Samsung loaded extra functions into the Side Key, a long-press of that button combo will trigger the power off menu instead.