Hello,
You could remove the rounded corner by adding the following code to the Platforms/Windows/App.xaml
file in your MAUI project.
<maui:MauiWinUIApplication.Resources>
<CornerRadius x:Key="OverlayCornerRadius">0</CornerRadius>
</maui:MauiWinUIApplication.Resources>
Best Regards,
Alec Liu.
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