Clicking on linchart or slider will accept any label typed but not already accepted.
MODIFY
WalletWasabi.Fluent/Views/Wallets/Send/SendView.axaml
WalletWasabi.Fluent/Views/Wallets/Send/SendView.axaml
KeyboardNavigation.IsTabStop="False"
DockPanel.Dock="Bottom"
Classes="cursor"
+ Focusable="True"
Minimum="{Binding XAxisMinValue}"
Maximum="{Binding XAxisMaxValue}"
Value="{Binding XAxisCurrentValueIndex}">
AreaStrokeLineCap="Round"
AreaMinViableWidth="40"
AreaMinViableHeight="20"
+ Focusable="True"
YAxisTitle="More Expensive">
<c:LineChart.AreaFill>
<LinearGradientBrush StartPoint="50%,0%" EndPoint="50%,100%" Opacity="0.2">

Clicking on linchart or slider will accept any label typed but not already accepted.