I used the code below to set the width of ContentDialog
<ContentDialog
x:Class="MyAPP.SettingContentDialog"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Picvac_UWP"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Title="Random Select the number"
PrimaryButtonText="Cancel"
SecondaryButtonText="Ok"
Width="800"
>
but the width ContentDialog never can be more than 550 pixels
it looks like
Width="800"
does not work.
I also try to change the width of the Grid in ContentDialog to more than 550 pixels, the width of ContentDialog always is 550
Your comment welcome