How user set settings?
User clicked on Export icon
Selected Spreadsheet option (Or any other option)
User selected checkbox “Always Use Selected Format”
When next time user try to export SAP GUI will not ask what Formats they want to save
Solution:
Run SA38 TCode
Run Report : SALV_BS_ADMIN_MAINTAIN
Select : User-Specific Settings for SAP GUI ALV
Remove user from list
Continue
Now doing this user will able to select Formatting option again