Reordering custom fields in settings control how they appear in a contact profile under the “Additional Info” tab.
Here's how to Reorder a Custom Field:
Contacts Settings - How To Reorder Custom Fields - Step 01
Click "Contacts"
Contacts Settings - How To Reorder Custom Fields - Step 02
Click the Settings "settings" icon.
Contacts Settings - How To Reorder Custom Fields - Step 03
Click "Hamburger Icon" next to the Custom Value you wish to reorder.
Contacts Settings - How To Reorder Custom Fields - Step 04
Drag your Custom Value up or down to the new position you desire.