Hello,
Thanks for using our theme.
Provide an example, please. About changes in the header, Theme Options > Speed Optimization > Menu Dropdown Ajax Loading, Menu Cache, Static Blocks Cache > Off. Activate mentioned options once all changes to the header/menu will be done. Also, we can see, additional caching on your site – https://prnt.sc/26qgxcm , so likely you need to clear that cache to be able to see changes or temporarily disable that cache.
Regards