You can customize search element style and function of the main header part in theme options panel -> Header -> Search Element.

Custom Search Icon: Upload custom search icon. Original icon is a homemarket search icon font.
Search Form Style: Change search form view style or disable search icon.
Ajax Search: Enable/disable ajax search form.
Search Post Type: Choose search post type such as posts, woocommerce products, portfolio.
Show Dropdown Categories: Show/hide custom post taxonomy dropdown menu.
Show Sub Categories: Show/hide sub category dropdown menu, if “Show Dropdown Categories” option is enabled.