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If you’d like to display the app icon, and open the app instead of a specific barcode, you can do so by configuring a Single Card widget like below. Add a Single Card widget to your Home Screen and then hold down on the widget to edit it. Tap the card selection, where it says “Choose” or the name of a card, and tap “[Open Barcodes app]” instead. This will show the app icon as shown in the last screenshot!
Home Screen with a Barcodes widget added
Edit Widget menu for the Barcodes widget
Widget configuration screen for a single card widget
Card picker for choosing what the widget opens
Widget configuration with Open Barcodes app selected
Home Screen widget displaying the Barcodes app icon