I can't select multiple options on a menu item
Say, for example you sell pizza and want to offer multiple toppings on an pizza order. But when you test your menu ordering, you only get to choose one topping.
The fix is simple. It's a checkbox option under the Menu Item.
From your account Dashboard, select Menu. Select the proper Category, and then select the proper Menu Item to Edit. Under the Options section you will see a checkbox for “Allow Multiple Choices”. Make sure this Option is enabled.
Be sure to hit Submit on the bottom of the page to save any changes.
Note: you may need to repeat these steps for each Menu Item.