If the category is showing in red on menu prices tab and are unable to select from the drop-down listing or not appearing on the ingredients, check the menu is active by following the below steps.
Go to the Admin Cogs
icon.Click on Menu, Dishes & Recipes.
Click on Manage Menus.
Click on All on Show section.
Any menus that are deactivated will appear, click on the lightbulb to reactivate.
The category will then appear, and you should be able to select the options.