always show both currencies.
MODIFY
WalletWasabi.Fluent/Controls/CurrencyEntryBox.axaml
WalletWasabi.Fluent/Controls/CurrencyEntryBox.axaml
DockPanel.Dock="Right"
Opacity="0.5"
Text="{TemplateBinding ConversionText}"
- IsVisible="{TemplateBinding ConversionText, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
<Panel>
Opacity="0.5"
Margin="5 0 0 0"
Text="{TemplateBinding CurrencyCode}"
- IsVisible="{TemplateBinding Text, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
</StackPanel>
</Grid>
</Border>
<Button x:Name="PART_SwapButton" Focusable="False"
- IsVisible="{TemplateBinding ConversionText, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"
Cursor="Arrow" HorizontalAlignment="Center" Background="Transparent" BorderBrush="Transparent" BorderThickness="0" Padding="0" Margin="0">
<PathIcon Data="{StaticResource arrow_swap}" Width="16" />
</Button>

always show both currencies.