How to increase size of a Grid that Contains a Drawing Canvas in a Stack Layout in Xamarin - xaml

Question

My code below creates what is shown in the picture below where the label's text is from an API I am calling. Also the drawing canvas is taken from https://github.com/xamarin/xamarin-forms-samples/tree/master/SkiaSharpForms/Demos/Demos/SkiaSharpFormsDemos. I was wondering how to make the drawing canvas more larger in height? Thank you.
<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:skia="clr-namespace:SkiaSharp.Views.Forms;assembly=SkiaSharp.Views.Forms"
xmlns:tt="clr-namespace:TouchTracking"
x:Class="MathKumu.Pages.WorkPage">
<ContentPage.Content>
<StackLayout>
<Label Text="{Binding EquationString}" />
<Entry Placeholder="Put Answer Here" />
<Grid BackgroundColor="White">
<skia:SKCanvasView x:Name="canvasView"
PaintSurface="OnCanvasViewPaintSurface"/>
<Grid.Effects>
<tt:TouchEffect Capture="True"
TouchAction="OnTouchEffectAction" />
</Grid.Effects>
</Grid>
</StackLayout>
</ContentPage.Content>
</ContentPage>

Answer 1

Change your StackLayout to a Grid and specify that Row 2 has a Height of *. That will force Row 2 to consume all extra space.
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:skia="clr-namespace:SkiaSharp.Views.Forms;assembly=SkiaSharp.Views.Forms"
xmlns:tt="clr-namespace:TouchTracking"
x:Class="MathKumu.Pages.WorkPage">
<ContentPage.Content>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
<Grid.RowDefinitions>
<Label Grid.Row="0" Text="{Binding EquationString}" />
<Entry Grid.Row="1" Placeholder="Put Answer Here" />
<Grid Grid.Row="2" BackgroundColor="White">
<skia:SKCanvasView x:Name="canvasView"
PaintSurface="OnCanvasViewPaintSurface"/>
<Grid.Effects>
<tt:TouchEffect Capture="True"
TouchAction="OnTouchEffectAction" />
</Grid.Effects>
</Grid>
</Grid>
</ContentPage.Content>
</ContentPage>