User can hide the Expand/Collapsed sign in GroupBarItem. It can be achieved by setting the Expander button visibility as Collapsed. This Expander button can be fetched by the name "Expander" from Template using FindName method. The following code demonstrates the same.
Code Example: [Xaml]
Code Example: [C#]
This page will automatically be redirected to the sign-in page in 10 seconds.