local folder shows mailbox://nobody@Local Folders/Inbox and I can not change it

mailbox://nobody@Local Folders/Inbox is your local inbox folder on local folders because that is what it is called for every Thunderbird installation over the last 20 or 30 years. This mine <img src=https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/images/2026-09-24-17-15-48-e91bf0.png> I have no idea what you are trying to achieve or why, so perhaps backup and slowdown enough to explain what the real problem is. What you have asked indicates you think something else should be happening or you should see something else, but I have no idea what..