correct watermark
MODIFY
WalletWasabi.Fluent/Views/Wallets/Send/AdvancedSendOptionsView.axaml
WalletWasabi.Fluent/Views/Wallets/Send/AdvancedSendOptionsView.axaml
<!-- Custom Fee -->
<DockPanel DockPanel.Dock="Top" Margin="0,0,0,10" VerticalAlignment="Top">
<Label DockPanel.Dock="Top" Content="_Transaction fee rate:" Target="transactionFeeTb" />
- <TextBox x:Name="transactionFeeTb" MaxLength="250" Text="{Binding CustomFee}" Watermark="Enter a custom sat/vByte amount">
+ <TextBox x:Name="transactionFeeTb" MaxLength="250" Text="{Binding CustomFee}" Watermark="Enter a custom fee rate (sat/vByte)">
<i:Interaction.Behaviors>
<behaviors:FocusOnAttachedBehavior />
</i:Interaction.Behaviors>

correct watermark