The plugin developer kindly provides this tutorial. This is a complex but very well-documented plugin. Due to the huge documentation size, this general guide links to the relevant information. Please check these links for more detailed documentation on how to build multilingual sites with Elementor and WPML:
https://wpml.org/documentation/plugins-compatibility/elementor/
https://wpml.org/plugin/elementor/
https://wpml.org/announcements/2018/08/how-to-translate-elementor-designs-the-easy-way-with-wpml/
https://elementor.com/blog/translate-elementor-with-wpml/