The option to view the past invoices in the upper left corner of the invoice template is not yet available in the new invoice layout, however, you can still access it through at the left navigation table.
Here's how:
Log in to your QuickBooks Online account.
At the left navigation table, select Sales.
Select Invoice.
From there, you can view the invoices you create from the past up to your most recent transactions.
You can also check this article for more details and help personalize and manage your invoices in QuickBooks Online: