When you create a custom field you have the option of specifying a default value.
You can see the default value is “true”
Now, its also possible to override this value in a question node. You have to assign the question a custom field and provide values.
Here you can see the default value is “Default”
So even though we defined the default value previously, the value in this node will take preference.
Note that because we are using a checkbox field, in this example its possible to select two answers. They will display like this: