ScanPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:scanner="clr-namespace:BarcodeScanning;assembly=BarcodeScanning.Native.Maui"
             x:Class="Pl.Tablet.Client.ScanPage"
             Unloaded="ContentPage_Unloaded"
             >
    <AbsoluteLayout>
        <scanner:CameraView AbsoluteLayout.LayoutFlags="All"
                            AbsoluteLayout.LayoutBounds="0,0,1,1"
                            OnDetectionFinished="CameraView_OnDetectionFinished"
                            x:Name="Barcode"/>
        <Button Text="←"
                AbsoluteLayout.LayoutBounds="0.01, 0.01, 70, 70"
                AbsoluteLayout.LayoutFlags="PositionProportional"
                Clicked="OnBackButtonClicked"
                BackgroundColor="White"
                TextColor="Black"
                CornerRadius="35"
                FontSize="40"
                Padding="0,0,0,20"
                />
    </AbsoluteLayout>
</ContentPage>