Hello @osamformations,
The issue is unrelated to the theme, and the custom header menu(elementor header) hasn’t had the right z-index property. To fix the issue, you can set the higher number for the z-index, or please put the CSS below in Customizing > Custom CSS/JS > CSS Code:
#wrap .elementor-element-4f297e4 {
position: relative;
z-index: 99999999 !important;
}
For more information about the CSS/JS code on the customizer, please read this link:
https://docs.oceanwp.org/article/354-add-custom-css-and-js-to-your-website
Best Regards