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Take a look at KeyboardFlags , we can customize the Keyboard behavior in xaml like below
<SearchBar
x:Name="SearchBar"
Placeholder="Search for a business..."
HorizontalTextAlignment="Start"
SearchCommand="{Binding PerformSearch}"
SearchCommandParameter="{Binding Text, Source={x:Reference SearchBar}}">
<SearchBar.Keyboard>
<Keyboard x:FactoryMethod="Create">
<x:Arguments>
<KeyboardFlags>None</KeyboardFlags>
</x:Arguments>
</Keyboard>
</SearchBar.Keyboard>
</SearchBar>
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