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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!

Clarion Technologies

Yogesh Dalavi

Author filters plugin has been developed with an idea to add an option to sort page, post, custom post type listing with respect to authors.
Currently in WordPress core installation we have an option to sort post, page, custom post type grids with respect to category etc. However, currently an option to sort or filter the records with respect to author adds one more option to administrators to sort the listing.

Author Filters

Using this in WordPress 4.8, works perfectly for Pages, Posts and Custom Post Types.  Simply activate the Plugin, that's it.

Does the Job!

Author filters plugin integrates an author filter drop down to sort listing on post, page, custom post type in admin.

WP Sort Posts vs Author Filters