It also includes information on how to force close apps and how to reboot the Apple Watch.
On your Apple Watch, press and release theside button(not the digital crown) once.
Using your finger or the digital crown, scroll through the open apps.

choose the app you want to close and swipe from right to left on it.
Tap the largeXin a red box to end the app.
Closing an app does not remove it from the Apple Watch.

You must be in the app to force it to close.
Confirm by tappingDelete App.