Greetings, jennweed1.

As of the moment, many of the keyboard commands you might use in other programs won't work the same way in QuickBooks. I want to let you know that we're taking note of your feedback and suggestions to improve the experience we're providing. 

You can undo transactions by clicking either the Clear or Revert buttons in QuickBooks. Press the Clear button to delete any information you added in a new transaction that you haven't yet saved in one of the customer, employee or vendor centers. Or click Revert to undo all changes made since the previous save.

I also recommend creating a  backup copy before creating any changes, so you have an option to restore the file and avoid any accidental data loss.

Additionally, you can check the following article for keyboard shortcuts while working in your account: QuickBooks Desktop keyboard shortcuts.

Thanks for dropping by. Please know that I'm just a few clicks away if you have any other questions about QuickBooks. I'll be happy to help you out. Have a great day ahead.