How do I find previous invoices I've sent or customers I've set up?? Everything seems to have just disappeared!!

Welcome to the Community, @ewood. Thank you for using QuickBooks when communicating with your customers. I've got some troubleshooting steps we can perform to locate the invoices and customers that disappeared.

The cache piled up on your browser affects the program's display. To isolate this, use a private browser to access your QuickBooks account. It doesn't retain local files to help rule out the possibility of a webpage issue.

Here are the keyboard shortcuts:

• For Firefox, press Ctrl + Shift + P
• For Chrome, press Ctrl + Shift + N
• For Safari, hold down Command + Shift + N

After that, let's go to the Sales button and select Invoices. You'll be able to see the status of sent invoices from there. The customers you've set up are also visible under the Customers tab.

If this works, you’ll need to clear the browser's cache so you can start with a clean slate. You can also use other supported browsers as alternatives.

See this article to learn more about personalising sales forms: Customise invoices, estimates, and sales receipts in QuickBooks Online.

You can also check out this link for the complete process of receiving payments: Record invoice payments in QuickBooks Online.

You're always welcome to reply in the comments below if you have additional questions about the missing invoices and customers. We're here to help you anytime. Keep safe.