...
In the screenshot below, Custom Field 5 is configured with a set of values, whereas Custom field 6 does not.
...
Editing the Custom Field Values in the Order Editor
When editing the custom fields of an existing order, navigate to the ‘Other’ tab in the order editor:
In the ‘Other’ tab of the order editor scroll down to the Custom Fields:
Viewing these field in the order editor, they appear like this:
...