Below is a complete sample of the code needed to perform a frameless window with dragging capabilities.

public class Game1 : Game
    {
        private GraphicsDeviceManager _graphics;
        private SpriteBatch _spriteBatch;

        // Fields to track dragging state
        private bool _isDragging = false;
        private Point _dragOffset;

        public Game1()
        {
            _graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
            IsMouseVisible = true;

            // Hide the window frame
            Window.IsBorderless = true;
        }

        protected override void Initialize()
        {
            // TODO: Add your initialization logic here

            base.Initialize();
        }

        protected override void LoadContent()
        {
            _spriteBatch = new SpriteBatch(GraphicsDevice);

            // TODO: use this.Content to load your game content here
        }

        protected override void Update(GameTime gameTime)
        {
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == 
            ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
                Exit();

            // Get the keyboard state
            var keyboardState = Keyboard.GetState();

            // If keyboard spacekey pressed toggle Window Borderless
            if (keyboardState.IsKeyDown(Keys.Space))
            {
                Window.IsBorderless = !Window.IsBorderless;
            }

            // Handle window dragging only if the window frame is hidden
            if (Window.IsBorderless)
            {
                var mouseState = Mouse.GetState();
                if (mouseState.LeftButton == ButtonState.Pressed)
                {
                    if (!_isDragging)
                    {
                        // Start dragging if the mouse is near the top of the window
                        if (mouseState.Y < 30) // Adjust the value as needed
                        {
                            _isDragging = true;
                            _dragOffset = new Point(mouseState.X, mouseState.Y);
                        }
                    }
                    else
                    {
                        // Move the window
                        var newPosition = new Point(mouseState.X - 
                        _dragOffset.X, mouseState.Y - _dragOffset.Y);
                        Window.Position = new Point(Window.Position.X +
                         newPosition.X, Window.Position.Y + newPosition.Y);
                    }
                }
                else
                {
                    _isDragging = false;
                }
            }

            // TODO: Add your update logic here

            base.Update(gameTime);
        }

        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);

            // TODO: Add your drawing code here

            base.Draw(gameTime);
        }
    }

When capturing the screen using Snippint Tool, with window frameless enabled, the game window will shift off screen, untested on a single display, but this throws it off screen onto another screen on a multi monitor setup. the window toggle was added to help remedy this.