It's good to have you here in the Intuit Community, melanie-shilling,
I’d be happy to show you on how to edit column widths for your sales invoice.
Here's what you'll need to do:
That's it! For future reference, you can read through this article for the complete details about customizing invoices in QuickBooks Online: How to customise invoices, estimates, and sales receipts.
If there’s anything else I can help you in customising invoices, please let me know. I’m always here to help. Have a great day!