Now that Samsung is shipping the Galaxy Note 10 and 10 Plus, you’ll find that the traditional method for powering off the phones doesn’t work. Instead, you have to use a new key combination or change its default settings. Here’s how.
Power Off with Physical Buttons
On almost every other Android smartphone or tablet, you can turn the device off by long-pressing the power button. This action typically launches the power menu that allows you to power off the phone, restart it, or more. On Samsung’s new flagships, this opens the Bixby virtual assistant.
With the Galaxy Note 10 and 10 Plus, Samsung included a new key combination for launching the power menu. Instead of just pressing and holding the power button (which Samsung calls the “Side key”), you need to press and hold the power and volume down buttons at the same time for several seconds.
You can let go of both bottoms when the power menu appears on-screen. Now, all you need to do is tap on “Power off,” and your Samsung Galaxy Note 10 or 10 Plus will turn off.
Change Side Button’s Press and Hold Action
As mentioned above, Samsung allows you to change the default behavior of long-pressing the power button. Here’s how you can change it if you’d rather jump straight into the power menu instead of launching Bixby.
First, swipe down from the top of the screen so that the notification shade is showing. Next, tap on the gear icon in the top-right corner to open the Settings menu.
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Source : How to Power Off Your Samsung Galaxy Note 10 or 10 Plus