At this time this is not something you can config. You would need to edit the code (ZmContactView.js):
Code:
ZmContactView._selectFields = {
"fileAs": [
{ name: ZmContact._AB_FILE_AS[ZmContact.FA_LAST_C_FIRST], selected: true },
{ name: ZmContact._AB_FILE_AS[ZmContact.FA_FIRST_LAST], selected: false },
{ name: ZmContact._AB_FILE_AS[ZmContact.FA_COMPANY], selected: false },
{ name: ZmContact._AB_FILE_AS[ZmContact.FA_LAST_C_FIRST_COMPANY], selected: false },
{ name: ZmContact._AB_FILE_AS[ZmContact.FA_FIRST_LAST_COMPANY], selected: false },
{ name: ZmContact._AB_FILE_AS[ZmContact.FA_COMPANY_LAST_C_FIRST], selected: false },
{ name: ZmContact._AB_FILE_AS[ZmContact.FA_COMPANY_FIRST_LAST], selected: false }
]
}; Of course in a production install you'd need to edit ZimbraMail_all.js and then rezip it.
zip -c ZimbraMail_all.js > ZimbraMail_all.js.zgz