I cannot resize a new window

Eduardo Gomez Romero 185 Reputation points

I have a Main page with two buttons

    <Grid RowDefinitions="200, *">
                Text="Open page 1" />
                Text="Open Page 2" />


  private void page2Btn_Clicked(object sender, EventArgs e) {
      WindowHelper.OpenWindow(new Page1 { MinimumWidthRequest = 100, MinimumHeightRequest = 100 });
  private void page1Btn_Clicked(object sender, EventArgs e) {
      Application.Current?.OpenWindow(new Window { Page = new Page_2() });

public static class WindowHelper {
    public static void OpenWindow(Page page) {
        if (page != null) {
            page.MinimumHeightRequest = 50;
            page.MinimumWidthRequest = 50;
            page.MaximumHeightRequest = 50;
            page.MaximumWidthRequest = 50;
            MainThread.BeginInvokeOnMainThread(() => {
                page.MinimumWidthRequest = 0;
                page.MinimumHeightRequest = 0;
                page.MaximumWidthRequest = double.PositiveInfinity;
                page.MaximumHeightRequest = double.PositiveInfinity;
            var newWindow = new Window() {
                Page = page

User's image

I need a Window to be smaller, and not just the page.

I am reading the docs, and it doesn't work.

Position and size a Window

The position and size of a window can be programmatically defined for a .NET MAUI app on Windows by setting the X, Y, Width, and Height properties on a Window object.


Mac Catalyst doesn't support resizing or repositioning windows programmatically by setting the X, Y, Width, and Height properties.

For example, to set the window position and size on launch you should override the CreateWindow method in your App class and set the X, Y, Width, and Height properties on a Window object:

public partial class App : Application
    public App()

    protected override Window CreateWindow(IActivationState activationState) =>
        new Window(new AppShell())
            Width = 700,
            Height = 500,
            X = 100,
            Y = 100

Alternatively, a window can be positioned and sized by accessing the Window property from any page, layout, or view. For example, the following code shows how to position a window in the center of the screen:

Mac Catalyst

Mac Catalyst doesn't support resizing or repositioning windows programmatically. However, a workaround to enable resizing is to set the MinimumWidth and MaximumWidth properties to the desired width of the window, and the MinimumHeight and MaximumHeight properties to the desired height of the window. This will trigger a resize, and you can then revert the properties back to their original values:

Window.MinimumWidth = 700;
Window.MaximumWidth = 700;
Window.MinimumHeight = 500;
Window.MaximumHeight = 500;

// Give the Window time to resize
Dispatcher.Dispatch(() =>
    Window.MinimumWidth = 0;
    Window.MinimumHeight = 0;
    Window.MaximumWidth = double.PositiveInfinity;
    Window.MaximumHeight = double.PositiveInfinity;

I am trying to make this work on mac and windows.

I want to be able to create a new window, with a specific size and a full scream.

I tried to make it full scream with this

 public static void OpenWindow(Page page) {
     if (page != null) {
         MainThread.BeginInvokeOnMainThread(() => {
             page.WidthRequest = DeviceDisplay.MainDisplayInfo.Width;
             page.HeightRequest = DeviceDisplay.MainDisplayInfo.Height;
         var newWindow = new Window() {
             Page = page
A Microsoft open-source framework for building native device applications spanning mobile, tablet, and desktop.
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Accepted answer
  1. Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 34,461 Reputation points Microsoft Vendor


    For resizing the created Windows, you should assign values to the width and height properties of the window when you create it.

    Please refer to the following code snippet:

    var newWindow = new Window()
        Page = page,
        Height = 200,
        Width = 300,

    Best Regards,

    Alec Liu.

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