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Sorry it is not possible – the second param can be used only as top level post field, so config fields won’t work. The only solution in this case is to create custom helper based on https://github.com/GetPublii/Publii/blob/master/app/back-end/modules/render-html/handlebars/helpers/orderby.js but please remember that it will work only if you have no pagination on the list. If there is a pagination – you will get only chunks of posts list which you can order per page but not for the whole list.