// get the windows forms window
var screen = System.Windows.Forms.Screen.FromHandle(Ark.Window.Handle);

// no more border
Ark.Window.IsBorderless = true;

// "full screen"
Form.FromHandle(Ark.Window.Handle).Location = new System.Drawing.Point(screen.Bounds.Left, screen.Bounds.Top);
SetWindowSize(screen.Bounds.Width, screen.Bounds.Height);