Field Ordering
Customized ordering of fields will not be respected when a form is upgraded. The exception is the order of fields on custom tabs. Their ordering will not change when Form Layout Enhancements are applied.
To create custom layouts, go to Customization > Forms > Transaction Form PDF Layouts or Customization > Forms > Transaction Form HTML Layouts, and click the Customize link next to a layout. Make your changes and click Save. You can choose default layouts to apply to one or more types of forms by checking boxes in the Preferred column at Customization > Forms > Transaction Form PDF Layouts or Customization > Forms > Transaction Form HTML Layouts, and clicking Submit.