practice/practiceApplicaiton/ClientEditPage.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"
             x:Class="practiceApplicaiton.ClientEditPage"
             Title="Клиент">
    <ScrollView>
        <VerticalStackLayout Padding="20" Spacing="12">
            <Label Text="Фамилия" FontAttributes="Bold" TextColor="#4472C4"/>
            <Entry x:Name="LastNameEntry" Placeholder="Иванов"/>
            <Label Text="Имя" FontAttributes="Bold" TextColor="#4472C4"/>
            <Entry x:Name="FirstNameEntry" Placeholder="Александр"/>
            <Label Text="Отчество" FontAttributes="Bold" TextColor="#4472C4"/>
            <Entry x:Name="PatronymicEntry" Placeholder="(необязательно)"/>
            <Label Text="Телефон" FontAttributes="Bold" TextColor="#4472C4"/>
            <Entry x:Name="PhoneEntry" Keyboard="Telephone" Placeholder="+79001234567"/>
            <Label Text="Турфирма" FontAttributes="Bold" TextColor="#4472C4"/>
            <Picker x:Name="FirmPicker" Title="Выберите турфирму" TextColor="#4472C4"/>
            <Button Text="Сохранить" BackgroundColor="#4472C4"
                    TextColor="White" CornerRadius="8" Clicked="OnSaveClicked"/>
        </VerticalStackLayout>
    </ScrollView>
</ContentPage>