Dial back the monospace font size a bit.
MODIFY
WalletWasabi.Gui/Styles/Styles.xaml
WalletWasabi.Gui/Styles/Styles.xaml
</Style>
<Style Selector="TextBox.monospaceFont">
<Setter Property="FontFamily" Value="{StaticResource MonospacedFont}"/>
- <Setter Property="FontSize" Value="16"/>
+ <Setter Property="FontSize" Value="14"/>
</Style>
<Style Selector="TextBlock.monospaceFont">
<Setter Property="FontFamily" Value="{StaticResource MonospacedFont}"/>
- <Setter Property="FontSize" Value="16"/>
+ <Setter Property="FontSize" Value="14"/>
</Style>
<Style Selector="TextBox.selectableTextBlock">
<Setter Property="Padding" Value="0" />

Dial back the monospace font size a bit.