Both Label in Grid (same column, diff row) move when text changed. Why? - xaml

Question

Video showing the simulator: https://youtu.be/3ajany0iaCw
The codes:
<Grid HorizontalOptions="Center" VerticalOptions="Center">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="4*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Switch Grid.Column="0"
HorizontalOptions="Center"
IsToggled="{Binding SwitchToggled}"/>
<Label Grid.Column="1"
HorizontalOptions="Center"
Text="{Binding SwitchToggled,
Converter={StaticResource Key=boolToStrConv}}"/>
<Switch Grid.Column="0" Grid.Row="1"
HorizontalOptions="Center"
x:Name="switch2"/>
<Label Grid.Column="1" Grid.Row="1"
HorizontalOptions="Center"
Text="{Binding Source={x:Reference switch2},
Path=IsToggled,
Converter={StaticResource Key=boolToStrConv}}"/>
</Grid>
My expectation is that no matter how the Label's text length is changed, it would both be centered - considering that both of them has a HorizontalOptions Center.
Why did this happened and how do I fix this?

Answer 1

You need to look at the container that is grid is within and the fact that you are centering (floating) your grid within that container.
Assign a background color to your grid and a different one to its container and you will see that its size depends upon what it is contains since you are * (star) its size and the grid itself is "floating" in the center of its container, change the contents of the grid, the size of the grid changes:
<Grid VerticalOptions="Center" HorizontalOptions="Center" BackgroundColor="Gray">
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Switch Grid.Column="0" HorizontalOptions="Center" BackgroundColor="Red" x:Name="switch1" />
<Label Grid.Column="1" HorizontalOptions="Center" BackgroundColor="Red" Text="False" x:Name="label1" />
<Switch Grid.Column="0" Grid.Row="1" HorizontalOptions="Center" BackgroundColor="Green" x:Name="switch2" />
<Label Grid.Column="1" Grid.Row="1" HorizontalOptions="Center" BackgroundColor="Green" Text="False" x:Name="label2" />
</Grid>
Lock the grid to fill its parent's width (via StartAndExpand in my example) and changing your label's text content will not cause your toggle's start position to move...
<Grid VerticalOptions="StartAndExpand" HorizontalOptions="FillAndExpand" BackgroundColor="Gray">
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Switch Grid.Column="0" HorizontalOptions="Center" BackgroundColor="Red" x:Name="switch1" />
<Label Grid.Column="1" HorizontalOptions="Center" BackgroundColor="Red" Text="False" x:Name="label1" />
<Switch Grid.Column="0" Grid.Row="1" HorizontalOptions="Center" BackgroundColor="Green" x:Name="switch2" />
<Label Grid.Column="1" Grid.Row="1" HorizontalOptions="Center" BackgroundColor="Green" Text="False" x:Name="label2" />
</Grid>