UWP Grid should have ShowGridLines property from WPF
The WPF Grid control had a ShowGridLines property. This is helpful for layout debugging. This property is missing in UWP.
Yulia Klein commented
Xaml controls have been open sourced, and the best place to propose changes is now on our https://github.com/Microsoft/microsoft-ui-xaml repo. In fact, there's a Grid feature proposal (https://github.com/Microsoft/microsoft-ui-xaml/issues/54) that should include this request.