Revision History

See the history of changes made to an Elementor page

This feature is a really handy way to view the changes you and your colleagues have made to an Elementor page on WordPress. You can see an entire list of revisions, which are created every time you hit the save button. Each revision is viewable as a preview, and when you want to revert to one, simply press the apply button.
Reaching the list of revisions is easy. Simply click on the hamburger icon on the top of the left panel, then click the 'Revision History' link. This will show the list of revisions available for the current page.
The Revision History feature is built on the basic WordPress Revisions system and enhances it. This means that any changes to the WP system will affect Elementor's revisions. For example: define( 'WP_POST_REVISIONS', 3 );
In case you are wondering what uses are there for Revision History, here is a list of common uses:

Go back if you make a mistake

Correcting mistakes is the most obvious use of revision history.  The ability to go back to a previous save frees you to tinker with the page design without restriction. You deleted a nice looking section by mistake? No worries, just revert to a previous version.
Compare different versions
The great thing about designing pages on the frontend with a live page builder is that you see the alterations right before your eyes. With Revision History, you also get the ability to switch back and forth between versions and visually compare the difference between alternative versions.
Work as a team
As Elementor continues to grow as a popular page builder, we consider its uses not only by single designers but by teams of designers, working together in a studio or company and designing websites collaboratively. In this aspect, our Template Library was a great improvement, because it let teams share Elementor page and section designs across websites.
Revision History is another improvement to teams working with Elementor, as it allows them to monitor their work, see who made changes and control the entire process of design. It can also help the head of the design team to track the performance of her design team.
Prevent site owner mistakes
A common designer fear is to hand off a finished website to the client, only to have the client work on the site and mess up the design. This fear has been enhanced by page builders, as clients can now edit their websites much easier than before. In the future, we plan to integrate a more elaborate role management system, letting you block the client from messing with the site design. 
For now, you can use Revision History as a way to revert back in case the client messes with your design. It is also recommended that you save all the website pages you create as templates and export them to your computer, but you can never have too many fallbacks. The Revision History also lets you pinpoint exactly what the client did, and how to fix it.
For Multi-author Writers
Some people, me included, write entire blog posts on Elementor. It's just easier to create a nice looking post and customize the post images and headlines just right. Revision History is also great for multi-author writers because on each save all text editor content is also saved. 
Teaching someone how to design
Finally, Revision History can be used as a teaching mechanism. Not just for newbies but for professional web designers as well. Hired a new designer to your studio? Show her exactly how you created a template layout, step by step, through the revision history.