MainPage.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:components="clr-namespace:imago.Components"
             xmlns:viewModels="clr-namespace:imago.ViewModels"
             x:DataType="viewModels:ImageViewModel"
             x:Class="imago.MainPage">

    <Grid BackgroundColor="{DynamicResource Secondary}">
        <components:ImageSelector IsVisible="{Binding IsImageVisible, Converter={StaticResource InvertBooleanConverter}}" />

        <Grid
            IsVisible="{Binding IsImageVisible}">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="300" />
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>

            <components:ConfigurationPanel Grid.Column="0" />
            <components:ImageViewer Grid.Column="1"></components:ImageViewer>
        </Grid>
    </Grid>
</ContentPage>