Hi, Jagdfalke. Allow me to share some information regarding disabling a closed account to sync with QuickBooks Self-Employed.

While the option to disable the closed account to sync with QuickBooks Self-Employed is currently unavailable, I'd suggest submitting feedback to our product developers. This way, we can enhance the program to help you manage your books.

Here's how:

1. On your QuickBooks Self-Employed account, click Assistant at the upper right corner.
2. Type in Submit Feedback and select Add a feature.
   
3. You'll be able to send your comments directly to our engineering team, which helps us focus on the features you want most.

You might find this article interesting: Delete bank and transaction data in QuickBooks Self-Employed. This will provide you steps on how to hide your bank accounts as well as deleting them.

In case you need help with categorizing your transactions in QuickBooks Self-Employed, you can refer to this article: Updates to expense categories in QuickBooks Self-Employed. This will help guide you on how to report your self-employed income and expenses.

Keep me posted if you have any other questions about QuickBooks Self-Employed. I'm always up to keep helping. Have a nice day!