Answer:
Please use the following steps to implement this feature…
- Go to Main Menu > Sales Management > Transaction > Sales Invoice (POS)(S> T> S)
- Alt + R
- Set "Print User Name = No"
- Save
Note: This option is available in Sale, Sale return and in Sale Order

For more details please visit: http://www.rancelab.com/help/fr6_sale_invoice_pos.htm