Editopia/Editopia.Editor/Pages/EditTrainer.xaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <StackPanel Orientation="Vertical" Gap="4">
    <TextBlock Classes="h1">Trainer Editor</TextBlock>
  </StackPanel>
</UserControl>