Search bar is section with custom menu (shop by category section), search options and social icons under main menu.
To enable search bar navigate to customizer – Search Bar & Social and enable the search bar.
After enablig this section, select menu that will display next to slider (shop by category field). If you dont have any menu, go to Appearance -> Menus and make new menu for that section. Than go back in customizer and assign this menu under “Shop By Category Menu”.
You can enable the social icons next to search field. Add URL of your social sites and enable the social icons.