set focus style, increased border thickness
MODIFY
WalletWasabi.Fluent/Styles/Styles.xaml
WalletWasabi.Fluent/Styles/Styles.xaml
<Setter Property="Padding" Value="15 10 15 8" />
</Style>
- <Style Selector="TextBox:pointerover /template/ Border#PART_BorderElement">
+ <Style Selector="TextBox:pointerover /template/ Border#PART_BorderElement, TextBox:focus /template/ Border#PART_BorderElement">
+ <Setter Property="BorderThickness" Value="0 0 0 3" />
<Setter Property="BorderBrush" Value="{StaticResource TextBoxPointOverBorderBrush}" />
<Setter Property="TextBox.Background" Value="{StaticResource TextBoxBackground}" />
+ <Setter Property="TextBox.Foreground" Value="{StaticResource TextBoxForeground}" />
</Style>
<!--TODO: not working, debug-->

MODIFY
WalletWasabi.Fluent/Views/SettingsPageView.axaml
WalletWasabi.Fluent/Views/SettingsPageView.axaml
<TextBlock Text="Settings" FontSize="22" VerticalAlignment="Center" HorizontalAlignment="Center" />
<Button Command="{Binding NextCommand}" Content="Next" />
<TextBox Watermark="Type here..."/>
+ <TextBox Watermark="Type here... #2"/>
</StackPanel>
</UserControl>

set focus style, increased border thickness