How can Showing a description for the invoice?

Welcome to the Community, @accounts359.

May I know if you're referring to the description when printing or sending an invoice? If so, all you need to do is to place a checkmark on the Description box in the invoice template.

Here's how:

1. In QuickBooks Online (QBO), go to the Gear icon at the top to get to the Custom form styles. 
2. Locate the invoice template you're using, then tick Edit under Action column. 
3. Proceed to the Content tab and click the Edit (pencil) option in the middle. 
4. In the Columns section, place a checkmark on the Description box.
5. Hit Done to save. 

If you want to know more about customising invoices and other sales forms, consider checking out this article: Customise invoices, estimates, and cash memos in QuickBooks Online.

Please let me know if you're referring to something else or if you have any other concerns, and I'll get back to you right away. I'm more than happy to answer them. Have an amazing rest of the day!