Sometimes, you regularly buy something at a particular store. If you switch on “use suggested amount” for the list*, the app remembers what you bought the last time in terms of quantity as well as marking of store, price and ecological. When you enter e.g. milk, it will update the item on the list to e.g. 3 milk (eco) at Lidl 1.5EUR when you sync the list the next time, if you had marked the last purchase of milk with Lidl and ecological and registered a crowdsourcing price of 1.5EUR**.
*) You the select list screen, you can tap the “pen” icon to the right of the list name to edit list properties.
**) The app saves your registered prices in a collective price database if you turn on “price crowdsourcing” under Menu – Settings.