Xamarin XAML Listview Custom Font Size and Styles
<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="XAMLListviewFontSize.ListviewDemo" Padding="0,20,0,0">
<ContentPage.Content>
<ListView x:Name="listViewCustom" HasUnevenRows="true">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout BackgroundColor="Lime" Orientation="Vertical">
<Label Text="{Binding name}" FontSize="50" TextColor="Blue" />
<Label Text="{Binding comment}" TextColor="#503026" />
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</ContentPage.Content>
</ContentPage>
Based on Xamarin.Forms - User Interface - ListView - Cell Appearance
Xamarin.Forms ListView Sample: Custom Cells