DebugVisualizerExtension/NrxDebugVisualizer/App.axaml

<Application xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             x:Class="NrxDebugVisualizer.App"
             RequestedThemeVariant="Default">
             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
 
    <Application.Styles>
        <SimpleTheme />
        <DockSimpleTheme />
    </Application.Styles>
</Application>