To add Search Box With Category Dropdown menu using product search shortcodes, you need to add product search shortcodes in the header section.
See below image to see front side changes of search box with category dropdown in the header section.
To add Search Box With Category Dropdown menu using product search shortcodes, you need to add product search shortcodes in the header section.
See below image to see front side changes of search box with category dropdown in the header section.