I'll take it from here and turn the table around for you, @Kimmylcla. I'll share some insights about the closed purchase orders and help you ensure that they are open when creating your bill.

A purchase order (PO) with a value of $0.00 is automatically closed if the Quantity column is also 0. This occurs because QuickBooks Online (QBO) recognizes that there is nothing to track or receive when all line items in the PO have zero quantities. As POs are typically used to request items from suppliers, I suggest entering a specific quantity in the Quantity column to ensure the bill remains open after clicking Save.

In addition, the shortcut key brings up the private browsing window for Firefox. If you use these keys in Chrome or Edge, it opens the print settings, which isn't something we need to do.

Your Audit Log is fine and just to clarify further, my colleague wanted to find out if there was a user who closed the purchase orders. You can use the filter options on your screenshot.

Additionally, you can check this article for more details: Add purchase orders to expenses, bills, or checks in QuickBooks Online

Moreover, you can visit this article to track your bills and record the payments in QBO: Enter and manage bills and bill payments in QuickBooks Online

If you have any concerns about your purchase orders or bills, please feel free to leave a comment. I'm here to assist you at any time.