Modifier Groups have configurations to set parameters for modifiers.
You can set the Minimum or the Maximum number of options that customers may select.
Under How many of these can a customer add?, you would have a Minimum of 1, so that a default is selected but customers are given the choice to change the selection. The Maximum would depend on how many modifiers you will allow your customers to choose for that item. For example, if a customer can add up to 2 sauces on their Poke Bowl, you would have a Minimum 1/Maximum 2. If the modifier is for a size option for a latte, you would have a Minimum 1/Maximum 1 so customers can only choose 1 size.
Example) Choose Size - Minimum 1/Maximum 1; Choose Up to 2 Sauces - Minimum 1/Maximum 2
Under How many of these can a customer add?, you would have a Minimum of 0, so that the Modifiers remain optional and customers are not forced to make a selection. For Modifier Groups such as “Add A Drink” where there is no limit, you would set the Maximum as 0 (unlimited). For other modifier groups where the modifiers are optional, but limited, you would set the Minimum as 0, and the Maximum as a limited number. For example, if the Modifier Group is “Extra Pizza Toppings”, but customers can only select up to 4 extra toppings, your Minimum would be 0, and your Maximum would be 4.
Example) Add A Drink - Minimum 0/Maximum 0
Example) Add Up to 4 Extra Toppings
Note: After the maximum number of options has been selected, other options will be greyed out.