So in XNA if you call GraphicsAdapter.DefaultAdapter.CurrentDisplayMode.Width or GraphicsAdapter.DefaultAdapter.CurrentDisplayMode.Height it will return the current desktop resolution. However in MonoGame it returns these values (800, 600).
That doesn’t work. because what viewport will return the current windows size of the application or game. What GraphicsAdapter.DefaultAdapter.CurrentDisplayMode.Width will return is the current desktop width, which in my case is 1920.