Hi @Knight107,

Thank you for joining the thread. 

As stated by my peers above, the Change Order window automatically appears when you make changes to an estimate. With that said, there isn't an option to enable or disable it. 

In your case, I suggest you run the Verify and Rebuild Utility tools to ensure there isn't any data corruption in your company file. 

If the issue persists, I suggest you contact our Technical Support team for further assistance. See this article for the steps: Contact QuickBooks Desktop support. It includes their hours of operation, so you know when they're available. 

Have other questions in mind about this process in QuickBooks Desktop? Post a comment below, and I'll answer it for you.