By default WordPress doesn't show the ID of any post, page, custom post type, taxonomy or any other items on the admin.
Plugin Tag: show id
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Show IDs by Echo
Show IDs on admin pages for posts, pages, categories, taxonomies, custom post types and more.
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Show Pages IDs
This plugin will show the IDs of posts and pages on the admin bar and on the admin panel.
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Show IDs by DraftPress
The Show IDs plugin displays the ID of all posts, categories, pages, taxonomies, users, tags, and more.