Change VerticalAlignment to Stretch
MODIFY
WalletWasabi.Fluent/Views/Wallets/WalletView.axaml
WalletWasabi.Fluent/Views/Wallets/WalletView.axaml
</ItemsControl>
</ScrollViewer>
<history:HistoryTable Name="HistoryTable" DataContext="{Binding History}" MaxWidth="1000"
- HorizontalAlignment="Left" VerticalAlignment="Top"
+ HorizontalAlignment="Left" VerticalAlignment="Stretch"
DockPanel.Dock="Bottom"/>
</DockPanel>
</c:ContentArea>

Change VerticalAlignment to Stretch