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I've got the steps you'll need on how to adjust your Description column in QuickBooks Online, deanandlori.
Please follow the step below:
Doing these steps, you'll have a bigger Description column in no time.
For more information, please check how to Customize Invoices and Sales Forms.
If I can be of any additional help with customizing your sales forms, please don't hesitate to add a comment below. I'll be sure to help you out.