I am building a site using WordPress, a divi theme, and a windows operating system (if that matters). On desktop, my website looks fine but when I shrink the window or when I access the website on a mobile device, the navigation window at the top of the site seems to disappear. Link to the website: assyrians.com
What I tried: I thought maybe the plugins were the problem and tried deactivating my plugins but nothing changed. The divi theme is currently on Version 3.19.14, not exactly the newest version, which is 4:18 but I don't think updating the theme is the reason why this is happening.
I open to any suggestions and appreciate any feedback, thank you.
Your navigation bar is there, but when the viewport is mobile it turns into a hamburger menu, actually you cannot see it because the button has a blank color just as the background. Try adding the following css to your page and you will see the menu.
.mobile_menu_bar:before {
color: red !important;
}
Or better try to edit the navigation menu with the divi builder customizer, select the phone preview and make your changes.
Divi documentation:
https://www.elegantthemes.com/documentation/divi/customizer-mobile/