Being able to switch back to the old invoice format will depend on your QuickBooks Online (QBO) subscription, @bexmg.
I know that certain updates may not be suitable for everyone. However, enhancements are made to optimize the user's product navigation. I'll share details about this.
Around 70k customers who use QBO Simple Start and Essentials will be transitioned to the new invoice layout starting April 24th, with no option to revert back.
Those users of QBO Plus and Advanced will still be able to revert to the old invoice layout before May 6. Here's how:
Click the +New menu.
Next, select Invoice.
Once opened, click the Old layout icon located at the top right corner of the page.
For more information about these changes, feel free to check these articles: