At 6:00, I am 100% sure you mean "resilience" instead of resilence". But at the rate Azure is releasing new features, I would not surprised to see resilence showing up soon. Be a good name for a firewall service.
At 6:10 Harini is telling us how to handle a specific "is this phone" UI. These are referred to as tailored experiences. The basic idea is that you don't; instead, you determine when you want to have a one-handed experience and to query the diagonal size of the physical device. This is not a visual state solution. This is a query on load and a separate XAML view.