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There are a lot of background colors that you can modify. Check your Styles.xaml.

below is a sample.

<Style TargetType="Page" ApplyToDerivedTypes="True">
        <Setter Property="BackgroundColor" Value="{AppThemeBinding Light={StaticResource BackgroundColor}, Dark={StaticResource Black}}" />
</Style>
    
<Style TargetType="Shell" ApplyToDerivedTypes="True">
        <Setter Property="Shell.BackgroundColor" Value="{AppThemeBinding Light={StaticResource Primary}, Dark={StaticResource Gray950}}" />
</Style>

<Style TargetType="NavigationPage">
        <Setter Property="BarBackgroundColor" Value="{AppThemeBinding Light={StaticResource Primary}, Dark={StaticResource Gray950}}" />
</Style>

<Style TargetType="TabbedPage">
        <Setter Property="BarBackgroundColor" Value="{AppThemeBinding Light={StaticResource White}, Dark={StaticResource Gray950}}" />
</Style>

Is this what are you looking for?

Hope that helps!

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