I created: di.xml on app/code/Filter/Sorting/etc <?xml version=”1.0″?> <config xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” xsi:noNamespaceSchemaLocation=”urn:magento:framework:ObjectManager/etc/config.xsd”> <type name=”MagentoCatalogModelConfig”> <plugin name=”Filter_Sorting::addCustomSortOptions” type=”FilterSortingPluginModelConfig” /> </type> <type name=”MagentoCatalogBlockProductProductListToolbar”> <plugin name=”Filter_Sorting::implementCustomSortOptions” type=”FilterSortingPluginProductProductListToolbar” […]