franckviennois In reference to your last post, You are getting similar configured title because similar menu item ID is coming from menu item which is parent for both the internal pages which are being rendered from Articles ยป Portfolio Layout component
The specific conditional field allows you to assign masshead to display in specific pages by using Itemid of that pages henceforth, the item id should be different which comes from menu item in order to have unique and different title/description to be shown