To learn how to expose a dictionary in the inspector refer to the class member visibility section of the documentation.
Adding New Elements
You can add new elements to the dictionary using the Add control. Specify the key that should be used for the new entry and press the button with the plus sign.
The key given must be unique according to the dictionary’s equality comparer. If it is not unique, the field will be tinted red and won’t be accepted.
Removing Existing Elements
You can remove elements from a dictionary by selecting one or more of them and then pressing the delete key on your keyboard. All of the selected elements will be removed from the dictionary.