Thanks for joining this conversation, @Rosa3.

You can edit the template that you're using to broaden the item description field. There are two ways on how to do this. The first one is to open the invoice that you've shown in the screenshot.

Here's how:

1. In QuickBooks Online (QBO), go to the Sales menu at the left pane to get to the Invoices page.
2. Locate and choose the invoice to open the transaction. 
3. Click the Customize option at the bottom and pick Edit current. 
4. In the Content tab, select the Pencil (edit) icon in the middle section. 
5. Tick the Edit Labels and Widths option and move the slider for the Description to change the width. 
6. Hit Done.

The second option is to go to the Custom Form Styles page. Please refer to this article for the detailed steps on how: Customize invoices, estimates, and sales receipts in QuickBooks Online.

Let me know if you have any other issues or concerns in the comment section below, and I'll get back to you right away. I'm more than happy to answer them. Have an amazing rest of the day!