You can set the display order of the standard and custom fields in addition to the display order of field values.
Standard fields appear in the following order:
1. Topic fields
2. Action fields
3. Attachment fields
The custom fields appear after the standard fields in the order you added them. You can modify the default sequence on the:
Notes: A field can only have one display order, even if it appears in more than one context. You can prevent a field from appearing when the topic or action is in a given state by assigning a field access level of hidden to the field for that state. This also applies to attachments of different types.