Avoid ExtraLight font weights cause they look a little bit tacky considering the normal font weights around them.
MODIFY
WalletWasabi.Fluent/Views/Login/LoginView.axaml
WalletWasabi.Fluent/Views/Login/LoginView.axaml
TextAlignment="Center"
HorizontalAlignment="Center"
FontSize="{StaticResource FontSizeH3}"
- FontWeight="ExtraLight"
Margin="0 10" />
<DockPanel IsVisible="{Binding ErrorMessage, Converter={x:Static StringConverters.IsNullOrEmpty}}"

MODIFY
WalletWasabi.Fluent/Views/Settings/ThemeChangeView.axaml
WalletWasabi.Fluent/Views/Settings/ThemeChangeView.axaml
<DockPanel VerticalAlignment="Center" Margin="40">
<TextBlock Text="Wasabi is changing theme..."
FontSize="20"
- FontWeight="ExtraLight"
DockPanel.Dock="Bottom"
Margin="10 20 10 0"
TextAlignment="Center"

Avoid ExtraLight font weights cause they look a little bit tacky considering the normal font weights around them.