bo/Workbench/QMonitor/qmonlib.ui/App.axaml

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

    <Application.Styles>
        <FluentTheme />
        <StyleInclude Source="avares://Avalonia.Controls.DataGrid/Themes/Fluent.xaml"/>
        <StyleInclude Source="/Styles/Dark.axaml" />
    </Application.Styles>
  <Application.Resources>
        <FontFamily x:Key="KarmaticArcadeFont">avares://qmonlib.ui/Assets/Fonts/ka1.ttf#Karmatic Arcade</FontFamily>
        <FontFamily x:Key="ScoreBoardFont">avares://qmonlib.ui/Assets/Fonts/scoreboard.ttf#Score Board</FontFamily>
      <FontFamily x:Key="ArcadeClassicFont">avares://qmonlib.ui/Assets/Fonts/ArcadeClassic.ttf#Arcade Classic</FontFamily>
      <FontFamily x:Key="BasicDotsFont">avares://qmonlib.ui/Assets/Fonts/Basicdots.TTF#BasicDots</FontFamily>
      <FontFamily x:Key="DosisLightFont">avares://qmonlib.ui/Assets/Fonts/DosisLight.ttf#Dosis</FontFamily>
      <FontFamily x:Key="DosisSemiBoldFont">avares://qmonlib.ui/Assets/Fonts/DosisSemiBold.ttf#Dosis</FontFamily>
  </Application.Resources>
</Application>