Thank you for getting in touch.
I’m afraid that the West Pro theme doesn’t have such that feature at the moment. Achieving this objective requires a couple of PHP code modifications in inc/pro/modules/module-timeline/module-timeline.php file; you should need to change the WP query parameter, then add additional module option field to set the number of items should be displayed. Thus I’d recommend you hire a freelancer from Codeable as it’s considered as an advanced customisation.
Thank you for your understanding.