To modify the interface of QuickBooks Online, the steps depend on the specific feature or layout you want to alter, Robyn.

For reports, you can switch back to the classic view if you're referring to report layouts.

Here's how to switch to the classic view:

1. Navigate to Reports.
2. Select the specific reports you want to modify the view.
3. In the top right corner, click on Switch to classic view.

For the Invoice's new layout, there isn’t an option to revert directly. In this case, we recommend sending your feedback to our product development team. Your input helps us improve the platform and better meet your needs.

Here's how:

1. Click the Gear icon, then select Feedback.
2. Describe your ideas or suggestions for improvement.
3. Click Next to submit the feedback.

If you're referring to other options or features, please provide more details or screenshots to help us understand what you mean by a previous look.

You can check this article on how to customize your navigation menu in QBO: Understand the navigation menu.

Please feel free to reach back out if you have any other questions. We're here to provide continuous assistance.