Set BorderThickness, BorderBrush
MODIFY
WalletWasabi.Fluent/Styles/Styles.xaml
WalletWasabi.Fluent/Styles/Styles.xaml
<Setter Property="IsPaneOpen" Value="True" />
<Setter Property="PaneBackground" Value="{x:Null}" />
</Style>
+
+ <Style Selector="TextBox">
+ <Setter Property="BorderThickness" Value="0 0 0 2" />
+ <Setter Property="BorderBrush" Value="{DynamicResource SystemAccentColor}" />
+ </Style>
+
+ <!--TODO: not working, debug-->
+ <Style Selector="TextBox /template/ Border#PART_BorderElement">
+ <Setter Property="CornerRadius" Value="0" />
+ </Style>
+
</Styles>

MODIFY
WalletWasabi.Fluent/Views/SettingsPageView.axaml
WalletWasabi.Fluent/Views/SettingsPageView.axaml
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
x:Class="WalletWasabi.Fluent.Views.SettingsPageView">
- <Panel>
+ <StackPanel Spacing="10">
<TextBlock Text="Settings" FontSize="22" VerticalAlignment="Center" HorizontalAlignment="Center" />
<Button Command="{Binding NextCommand}" Content="Next" />
- </Panel>
+ <TextBox Watermark="Type here..."/>
+ </StackPanel>
</UserControl>

Set BorderThickness, BorderBrush