Can the open window be saved in Quickbook on line?

Let me help you, Ipreys47.

You're unable to save an open window in QuickBooks Online. However, you can still return to the Profit and Loss report after opening an invoice from there. 

Here's how:

1. Close the invoice. Then, you'll be routed back to the Transaction report page.
2. Click Back to report summary above the Report period section to return to the Profit and Loss report page.

You can also customize the report to show specific accounts and format things the way you want them.

If there's something else that you need, please feel free to keep in touch with us. Take care!