When I need to look at a customer's past invoice, the old system was to simply click it and it opened. Now the button is an edit. Can I just click to open them?

I understand that you're concerned about the change in the interface for accessing past invoices in QuickBooks Online (QBO), @TS1956. I'm here to help you understand the new interface and provide you with the necessary information. 

In the new QBO interface, the option to view past invoices has been replaced with an Edit button. I understand that the previous method was more convenient for you as you could easily open the invoice by clicking on it. 

We value your feedback and understand that transitioning to a new interface can be difficult. Your input is critical in helping us improve our product and provide a better user experience. If you have any further suggestions or feedback regarding the new interface, please feel free to contact us. Your feedback is highly appreciated and will be considered for future updates. Here's how you can give your feedback: 

1. Select Settings, then click Feedback.
2. Enter your comments or product suggestions. 
3. Hit Next to submit Feedback.

Our product engineers will consider your suggestions, and you can always check the status of your request through this link: QuickBooks Online Customer Feedback.

Moreover, consider checking out this article for future reference: Customize invoices, estimates, and sales receipts in QuickBooks Online

Please extend your patience about this matter. If you have any other QuickBooks queries, please leave them in the comments section below. I'm only a few clicks away from assisting you once more. Have a wonderful day!