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This plugin adds a drop-down list with the ability to sort your blog posts: 
* sort by title; 
* sort by date (newest first); 
* sort by date (oldest first); 
* sort by date last modified.
Paste the following code in the templates ‘index.php’, ‘archive.php’, ‘category.php’ or/and ‘author.php’ etc.:
This tag must be before The Loop. For more information go to the “Installation”.

WP Sort Posts

Add the ability to sort the posts in the archives of your blog!

SilbinaryWolf

Ultimate Metabox Tabs adds metabox tabs to your posts, pages and the Advanced Custom Fields options page. 
They allow you to easily allow tabbable and sortable metaboxes on your editing page so that your client can do less scrolling and more editing. 
They’re also inserted at server-time, meaning no ugly javascript forcing the metaboxes into the page.

Ultimate Metabox Tabs

Ultimate Metabox Tabs allows for keeping your post/page and ACF options user friendly for your client with the use of tabs.

WP Sort Posts vs Ultimate Metabox Tabs