If the invoice preview is not showing complete item desription,you can check and follow given steps:
The invoice printout does not contain buyer details. How to ensure it prints buyer info?
To print buyer details in printout you can follow given steps:
Step 1:Go to The administration menu,
Step 2:Click configuration,
Step 3:Click invoice/Document printing,
Step 4:Click standard,
Step 5:Select sale invoice,
Step 6:In the Body column click self configured,here you can increase the width of item description according to the total width,make sure total width should be 136 only.
Step 7:Save this configuration,then go to the voucher and re print, your item description will be shown completely.