To remove column  you should go to the Settings > Account settings, then ( at the left menu > print settings) and find field "Customize print with CSS" and paste code:


Example for remove the product code column:

}

@media all{ 
  table.main_inv_table tr .code_col {
    display:none;
  }
}


Below are codes of rest of the columns:


nr_col
text_left
quantity_col
price_net_col
tax_col
tax_value_col
total_price_net_col


... so ... to  remove column just replace COLUMN-CODE with the right code.

}

@media all{ 
  table.main_inv_table tr .COLUMN-CODE {
    display:none;
  }
}



Below are examples of column codes