To enable this, create a smart collection named All Products and set the condition to 'Product price is greater than 0'. You can create a collection through the 'Collections' menu in Shopify admin. Or you can turn this section off through theme settings.
For allergens please see ingredients listed in bold.
Sugar, Dextrose, Gum Base, Glucose Syrup, Acid (Citric Acid), Flavourings, Modified Starch, Humectant (Glycerin), Colours (E133, E160a), Glazing Agents (Carnauba Wax, Shellac), Antioxidant (E321).