WP Show Post : Taxonomy for Post_Tag

Hi,

I would like to know if WP Show Post Taxonomy for Post_tag, am I able to specify a specific tag to be shown, just like how I can do it with the Category?

If I select category, it shows a dropdown list of available categories.

But when I select Post_tag, there isn't any dropdown list for the tags that i'd created.

In my case, I would like to show only 1 tag of all the posts.

I do not know coding if there's the only way to get it shown.

thanks!!