I would like to seek professional support who can design home pages and important menus. I tried multiple times by going to “Site Builder” but unsuccessful.

Employees of Zoho are not allowed to access your store directly under any circumstances. It is a violation under the user privacy policy laid down by the company. Support can only guide you with certain technical aspects, but not design your store for you.

Zoho Partners do designing work professionally, and recommendations can be provided. Zoho is not directly involved in website setup and design projects, and works only via partners.