How does the Xiaomi Watch S3 power on, shut down, and restart?

There are two buttons on the right side of the Xiaomi Watch S3, with the function button on the top and the power button on the bottom.
Here are detailed operations as below:
1. Power on
In the shutdown state, press and hold the power button for 3 seconds to turn on the watch and enter the main page;
2. Power off
(1). When the watch is turned on, press and hold the power button for 3 seconds to enter the page, select [Power off] to shut down;
(2). When turned on, open the [Settings] APP >> [System] >> [Power off] on the watch;
3. Reboot
(1). When the watch is turned on, press and hold the power button for 3 seconds to enter the page, select [Reboot];
(2). When turned on, press and hold the power button for about 12 seconds, and the watch will forcibly restart;
(3). When turned on, open the [Settings] APP >> [System] >> [Reboot] on the watch.