#1691·wpfui

Cannot disable resizing in FluentWindow

Author: mic2000zero-labCreated Apr 21, 2026Updated Aug 15, 2026
Labelsbug:star: top bug

Describe the bug

Dear devs,

I use ResizeMode="NoResize" in my XAML with a <ui:FluentWindow..., but the window is still resizable...

I understand this may be a design choice, to always be able to resize your windows... It would be so nice if you just use ResizeMode="NoResize" in your XAML that options to resize the window would dissapear. Mostly because you want small pop-ups with are you sure for instance... or exception pop-ups...

Is this a design choice, or is there a different property I have to use to disable resizing?

To Reproduce

<ui:FluentWindow xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:ui="http://schemas.lepo.co/wpfui/2022/xaml" x:Class="Namespace.Views.SomeView" mc:Ignorable="d" Title="Window Title" Height="376" Width="420" WindowStartupLocation="CenterScreen" ShowInTaskbar="False" ExtendsContentIntoTitleBar="True" WindowCornerPreference="Round" WindowBackdropType="Mica" ResizeMode="NoResize"

Expected behavior

The maximize, minimize buttons on the top right to be hidden, no cursor changes into resizing the window when placing the cursor at the edge of a FluentWindow

Screenshots

No response

OS version

Windows 11

.NET version

.NET10 WPF

WPF-UI NuGet version

4.2.0

Additional context

No response