If the user needs to shop for a different number of people than the recipe as is stored he musts resize the recipe, then add to shopping list. My suggestion is to add a feature in the shopping list that multiplies the amounts without modifying the recipe. Reproducible: Always
This project is unfortunately no longer maintained. If a new maintainer wants to step up and take care, the project is archived here: https://invent.kde.org/unmaintained/krecipes You can just clone it in your private namespace on invent.kde.org and if you have started to work on it and fixed/implemented something get it reviewed and the project unarchived. Sorry for the inconveniences.