Is there a way to resize and center a UWP app?

Question

I am writing a small UWP app which is going to be launched from another app (the main app). I am hoping to decrease the window size of the UWP app.

I was able to change the window size by adding the code commented below into the App constructor. But I couldn't figure out how to make the UWP app center screen after I changed the window size. Any advices on making the UWP center screen is appreciated.

public App()
{
    this.InitializeComponent();
    this.Suspending += OnSuspending;
    ApplicationView.PreferredLaunchViewSize = new Size(600, 400); //added code
    ApplicationView.PreferredLaunchWindowingMode = ApplicationViewWindowingMode.PreferredLaunchViewSize; //added code
}