Help appreciated thanks. A few watch faces I noticed allows you to click on a task manager shortcut on the face to clear any apps that are open or possibly running in the background.
Swipe down, settings, Advanced, double press home key, select the option for recent apps. So when you want to clear all the recently used apps, double press the home key, and then close all.
The very first icon in the menu (hit bottom button) is recent apps. It looks like two circles. Hit it and you have the option to close all apps.