Wpf-blend how to edit item template or control template visually in xaml designer?

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XAML

WPF

Blend

Hello everyone,
I have a treeview:

<TreeView Grid.ColumnSpan="2"  Margin="5" Background="LightYellow"
          ItemTemplate="{DynamicResource AccountsTreeViewItemTemplate}"
          x:Name="treeView1" FontFamily="Cairo" FontSize="16"/>

And here is the template:

<HierarchicalDataTemplate x:Key="AccountsTreeViewItemTemplate" ItemsSource="{Binding Children}" DataType="{x:Type local:AccountHierarchy}"  >
        <Grid >
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="1*" />
                <ColumnDefinition Width="1*" />
                
            </Grid.ColumnDefinitions>
            <TextBlock Text="{Binding Name}" Grid.Column="1" />
            <TextBlock Text="{Binding Id}"  />

        </Grid>
    </HierarchicalDataTemplate>

I am currently using Blend for VS 2022, version 17.0.5

In a previous version several years age, I remember doing so by editing current template ,
but now that option is disabled despite the template is assigned ..

I don't know if I am missing something or if there is a bug in blend?

(The template is working as it is, but I need to edit it visually in the designer)

What I have tried:

1. Right-Click the tree view -- edit additional templates -- edit generated items (item template) -- edit current .. but it is disabled

2. Tried to open the resource dictionary file (in which the template is defined) in the designer, but got :

Quote:

TreeViewStyles.xaml cannot be edited in the Design view.