The Milestone Widget is provided by Jetpack. It is only available on sites with Classic themes.
You need to add a Legacy Widget and set that to display a milestone. You should see on in the right hand sidebar of this page.
Examples of some of the widgets in Glow Blogs
The Milestone Widget is provided by Jetpack. It is only available on sites with Classic themes.
You need to add a Legacy Widget and set that to display a milestone. You should see on in the right hand sidebar of this page.