How Do I Restart My Apple Watch Series 4. Press and hold down the side button until you see three horizontal sliders. Go to the Apple Watch app on your iPhone.

After your watch turns off press and hold the side button again until you see the Apple logo. Hold down the side button until the Apple logo appears. Your Apple Watch must be disconnected from its charger to use the Power Off slider.
Turn off your Apple Watch.
After your watch turns off press and hold the side button again until you see the Apple logo. To hard reset your Apple Watch press and hold the side button and the Digital Crown at once until the Apple logo appears on the screen. Finally the user only needs to hit Erase All to confirm and return the Apple Watch to its factory settings. Put your watch on its charger and keep it there until you complete these steps.
