Take a look on how to tailor your module layout by using the “Module Layouts & Fields” settings. Vtiger 7 now provides a variety of ways to change the column order.
How to Change Column Order
Contacts field columns are set in the same order as shown on “Layout Editor” settings page.
Header Fields take precedence over Key Fields and are listed first in the columns field.
The “Header” section and “Key Fields” section are mutually exclusive (the same field detail cannot appear in both sections of the same record)
Modules without a summary view don’t have a “Key Fields” section but still use the key field details in the module’s related list
For example, the “Assets” module does not have a summary view, so it does not have a “Key Fields” section, but when it appears in a related list, the field details are shown in the column fields (more info on column fields in next section)