Hi there, bsarpa.
To remove a row on a journal entry, you'll need to click the trash bin icon on the right corner of the page. You can also click the Clear all lines or Ass lines button to choose how many lines do you want to see on the Journal Entry page.
If you wish to enter additional information while creating a journal entry, you can use the Description or Memo field.
You can click this article to see steps on how you can personalize your sales forms to make eye-catching designs in your transactions: Customize invoices, estimates, and sales receipts in QuickBooks Online.
In the meantime, I'd encourage you to visit our QuickBooks Blog, so you'll be updated with our latest news and updates including product improvements.
Please keep me posted in the comments down below if you have any other questions. I'll be happy to help.