shooflydesign

This plugin can override the Authors metabox on the post add/edit screen, letting users who can edit other people’s posts, reassign a post to others user on the site.
This is especially useful in situations where you’ve created custom user roles that WordPress doesn’t recognize as Authors. If you want to allow your content editors and administrators to assign new or existing content to anyone, you’ll (hopefully) like this plugin very much indeed.
On WordPress 5.0, the metabox will appear below the main block editor (see screenshot). I will be supporting updates to the Status & Visibility box as soon as possible.
I’m not sure how far back this plugin will work, I’m saying it requires 3.5 or greater — it was originally developed using WordPress 4.1.
(Inspired by <a href="https://core.trac.wordpress.org/ticket/18645" rel="nofollow ugc">this trac ticket</a>)

Better Author Metabox

Lets you safely override the built-in Author metabox with one that includes more users.

dale3h

Better User Search is a must have plugin if you’re running WooCommerce. Without it, you’re stuck trying to remember every 
customer’s username.
Better User Search is used to improve the user search functionality in the admin/backend.
WordPress by default only allows you to search for users by username/nicename. Using Better User Search, you will be able 
to search by first name, last name, email address and any custom user meta field that already exists in the user meta table.
On top of that, there is an “OR” feature provided. Just include the word “or” (case-insensitive) in your search query 
and the plugin will search for any user that matches at least 1 of the search terms.
“OR” Search Example: 
Let’s find all WooCommerce customers in Texas or Florida. To do this, first make sure that <code>billing_state</code> and <code>shipping_state</code> 
are setup in the Better User Search settings. Now head to the Users page and type “TX or FL” into the search field.
It really is that simple! 
Special characters like quotes are escaped, problems with the query may appear when trying to search for other non-alphanumeric characters.

Better User Search

I'm using this in the latest WordPress to allow searching ACF data in the User admin list and it's working great.

Still working great

Better User Search is a must have plugin if you're running WooCommerce. Without it, you're stuck trying to remember every

Better Author Metabox vs Better User Search