Porto provides live ajax search on header search box. To enable Live Search in the Porto theme, follow these steps:
Search by Sku: This option allows search products by sku.
Search by Product Tag: This option allows search products by tags.
In Porto > Template builder > Header page, you can create a header blocks. Inside the header block, you can add "Porto Search Form" widget. In that "Porto Search Form" widget, you can find same options "Search By". It has higher priority than this theme option's "Search By" setting.
