Hello @blaskk
Thank you for reaching out on the community and telling us about your issue. I do apologize for the issue you're having. If you'd like to remove an account you'll need to deactivate it from your account list. I'll leave an article down below on how to do so.
https://www.quicken.com/support/deactivate-online-banking-services-quicken-account
Please let us know if this helps resolve the issue for you.
Thanks,
Quicken Francisco