Must update it.

[MarwenAffi]

When you hold the click into an app, there is no button of (Force Stop) until you enter to the app info and you click on it, i hope you add it in the menu when you hold a click of an app.

[AndrewL]

@MarwenAffi: It does warn that Force Stopping an app can cause errors, which may be why the option is not as visible/accessible as you would like to to be. This may change in a future update, however for now please continue to press and hold on an app icon, then tap the small 'i' icon to access the Force Stop option.