marechai/Marechai.App/App.xaml

<Application x:Class="Marechai.App.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="using:Marechai.App.Presentation.Converters">

    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <!-- Load WinUI resources -->
                <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
                <!-- Load Uno.UI.Toolkit resources -->
                <ToolkitResources xmlns="using:Uno.Toolkit.UI" />
            </ResourceDictionary.MergedDictionaries>

            <!-- Add resources here -->
            <local:ObjectToVisibilityConverter x:Key="ObjectToVisibilityConverter" />
            <local:StringToVisibilityConverter x:Key="StringToVisibilityConverter" />
            <local:ZeroToVisibilityConverter x:Key="ZeroToVisibilityConverter" />

        </ResourceDictionary>
    </Application.Resources>

</Application>