Manoj

For creating a copy of posts and pages while retaining all the styling, content, title, meta info and taxonomies.
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In Posts/Pages screen, you can click on ‘Copy As New Draft’ link below the post/page title: this will immediately create a copy and return to the page.
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In Posts/Pages screen, you can click on ‘Edit As New Draft’ link below the post/page title: this will create a copy and redirect to edit the page.
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In Edit Posts/Edit Pages screen, you can click on ‘Edit As New Draft’ link above ‘Publish’ button: this will create a copy and redirect to edit the page.
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Please Note: No any kind of settings needed.

AMS Post And Page Duplicator

Ferry Abt

WP Ninjas

WP Ninjas - Jonas Tietgen

This Plugin lets you duplicate posts, pages and every other custom post type. Lightning fast and with only one click. The clone will contain all your content and every setting. It will be duplicated as a draft. 
There are two ways to duplicate:
<ul>
<li>Go to the dashboard and hover over the post you want to duplicate and click „duplicate”</li>
<li>When editing a post or viewing it in the frontend click „duplicate” in the admin bar</li>
</ul>
Cloning works for posts created with Gutenberg or the classic editor as well as with page builders. All the content, the categories, tags, featured image and every setting will be duplicated to a new post that is saved as a draft. 
The plugin does not have any settings, it works right out of the box.
<h4>Do you like the plugin?</h4>
<a href="https://wordpress.org/support/plugin/duplicate-pages-posts/reviews/?rate=5#new-post" rel="ugc">Leave a review</a>, it makes all the difference for us!

Duplicate Pages, Posts and CPT

Duplicate pages, posts and custom post types with all their settings and contents with a single click.

AMS Post And Page Duplicator vs Duplicate Pages, Posts and CPT