You have filled in all the required fields in the Food Ordering Services Feature, but the save button is still disabled. This article explains why this may occur and how you can work around it.
Having filled in the options for the Food Ordering Services Feature, you cannot Save your changes.
The save button on the Food Ordering tab might be disabled, due to an incorrect Lead Time value. Actually, the Save button on the Food Ordering tab is disabled if the Lead Time is set to a value less than 5 minutes, as per the message on the right.
In order to save changes to the Food Ordering feature, please make sure a minimum Lead Time of 5 minutes is set under the Services section since it's a required field.
After changing the Lead Time to a value that is either 5 minutes or larger, the Save button should become enabled & clickable.