Adding / Removing App on Start screen
Lightly drag from corner of screen top to center on Start screen
The installed App appears if you touch
which is in screen bottom
1. Right-Click the desired App, then there is menu in bottom of screen
2. Touch the Pin to start or Uninstall
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App on list can be closed by right-click
Using Window store
Can check the Apps of window store if run the store App on Start screen
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But need the Microsoft account for purchasing App in Windows store
Please use it after register Microsoft account in Charm menu