I’ve got multiply questions about menu styling.
I hope you are well today and thank you for your questions.
Is it possible to make phone number and email in topbar active links? tel: and mailto: links, respectively.
If you are talking about the header topbar options like email or phone number then you can make them clickable to have links by using the child theme solution shared in the following topic.
In Heading №10 is it possible to disable menu shadow on all 4 sides?
In Heading №10 is it possible to make a visible border (#1 on screenshot) between menu and topbar, just like the border between social icons and search (#2 on screenshot)? I am attaching screenshot link in the private information field.
You can try achieving this using Yellow Pencil editor as described in the below page.
Is there any real customization for mobile header? I want to have a phone number in it.
To achieve this, you have to develop custom code in the child theme of Jevelin theme.
Developing custom code for custom functionality is beyond the scope of support that we provide here. Please see https://themeforest.net/item/jevelin-multipurpose-premium-responsive-wordpress-theme/14728833/support
If you are not a developer then you can consider hiring a developer to develop it for you. You can hire a developer from any freelance site. Shufflehound recommends the developer https://www.upwork.com/freelancers/~011652ffec8865c6d5