Andrey Ovcharov

This plugin adds column with thumbnails featured images for selected post types

WP Thumbnail Column

This plugin adds column with thumbnails for selected post types

Evan Herman

Code Parrots

Timeline Express – Single Column Add-On extends Timeline Express, and enables a new shortcode parameter <code>single-column</code>.
When set to 1 (eg: <code>[timeline-express single-column="1"]</code>), the timeline will display in a single column – similar to the default Timeline Express mobile view.
Basic Usage
If you want to set a timeline to single column you can add the ‘single-column’ parameter to the <code>[timeline-express]</code> shortcode and set it to <code>1</code>.
Example 
 [timeline-express single-column=”1″]

Timeline Express – Single Column Add-On

Enable a 'single-column' parameter in Timeline Express to display timelines in a single column.

WP Thumbnail Column vs Timeline Express – Single Column Add-On