Dutch van Andel

This simple plugin is a must-have for anyone that works with custom taxonomies or post types – and is an especially good compliment 
to Brad Williams’ indispensable <a href="https://wordpress.org/extend/plugins/custom-post-type-ui/" title="Custom Post Type UI" rel="ugc">Custom Post Type UI</a> plugin.
By default, WordPress only shows built-in taxonomies in your administrative list tables (e.g. Categories & Tags). But 
if you rely on custom taxonomies for organization (particularly when working with custom post types) then you are 
typically out of luck.
This plugin fixes that – ensuring that custom taxonomies are added as columns to all necessary list tables automatically.
This is an initial release and includes no bells or whistles – but if you need this functionality, you’re likely a developer 
just looking for a good head start, anyway. If you have any improvements, additions, or suggestions, please leave a post in the 
WordPress.org forums with the correct <code>custom-taxonomy-columns</code> tag.

Custom Taxonomy Columns

Automatically adds custom taxonomy columns to admin list tables.

Chad Hovell

Select extra layouts from the post editor Screen Options menu. 
There are now 24 variations to choose from!

Three Column Screen Layout

Three, four and five column screen layouts for the post editor.

Custom Taxonomy Columns vs Three Column Screen Layout