Grosh crowdsources the location of stores, meaning it learns their location from where people mark groceries as bought. If you start the app at a location where many previous have marked items as bought, a sort button appears at the top right corner. The buttons leads to a screen that allows you to pick the store which you’re in. After this, Grosh will remember your choice and will show the store name in the header when you’re at that location.
If there are several different stores at the location, and there’s no store with majority of the shopping trips Grosh will not pre-select the store. A info bubble will appear and inform you of this. Please tap the sort button and select the correct store.