You have the ability to disable the Special Requests text box when customers are ordering.
Please note that if special requests are turned on, it will automatically give a disclaimer that no price-altering changes can be made.
Steps:
From the Owner Dashboard, click on Restaurant
Click on Menu
Click on the menu you'd like to disable instructions for
Scroll down to Advanced Settings
Toggle off Allow Special Instructions
Click Save
Please note: This will remove that box for all items on that menu. The process cannot be done for individual items.