You can control the additional requests option that appears on each product during checkout.
When the "Show Additional Requests" box is checked on the Account 〉 Online Order Settingspage, then another field labelled "Additional Requests hint text" is will be displayed and a custom hint can be entered.
Use the ☑ Show Additional Requests checkbox the Online Order Settings under Account 〉 Online Order Settingsto choose whether to enable or disable the "Additional Requests" field for customers for when they're adding products to their cart.
Use the "Additional Requests" field add custom placeholder text. This helps indicate the type of requests that you'd prefer. (For example, "e.g. allergies, extra spicy, etc")