I appreciate you joining the thread and detailing your concern about the compatibility of QuickBooks Desktop for macOS Sonoma. I'll share information relating to this matter.

QuickBooks Desktop 2020 is no longer supported, which could result in certain features becoming dysfunctional due to updates in the computer's operating system.

Should you encounter any complications, there are several options to consider. One option is to continue using QuickBooks Desktop 2020 on the current operating system that supports it. Alternatively, you might explore upgrading to a more recent version of QuickBooks that is officially compatible with the latest operating system updates.

I'm adding this article you can use in the future: Release Notes for QuickBooks Desktop for Mac 2020.

If you have any further questions or concerns, post them here in the forum. We're here to assist you in any possible way. Have a great day!