Currently in the process of creating a website using WordPress, specifically with a divi theme and utilizing a windows operating system. It seems that everything appears correctly on desktop, however when resizing the window or viewing the site on a mobile device, the navigation bar located at the top of the page disappears. Visit the website here: assyrians.com
Approaches I have taken: Initially, I suspected that plugins might be causing the issue so I proceeded to deactivate them but unfortunately, no changes occurred. The current version of the divi theme being used is 3.19.14, not the newest update which is Version 4.18. Despite this, I don't believe updating the theme is the root cause of the problem.
I am receptive to any suggestions and would greatly appreciate any feedback provided. Thank you for your assistance.