This widget is included in the free version of WPmozo Addons for Elementor. To display your blog posts in a horizontal scrolling layout, simply install and activate the WPmozo Addons Lite plugin. Download link:

https://wordpress.org/plugins/wpmozo-addons-lite-for-elementor

How to add widget on page

Once the WPMozo Addons plugin is activated, it adds a number of widgets to the Elementor builder. To insert the widget, use the following steps.

1. Create/edit a page/post that uses Elementor builder.
2. Create/edit container.
3. Search widget Horizontal Scrolling Posts under WPMozo.