Hi I'm using Thunderbird 140.5 on a desktop Mac running Sequoia 15.7.2 In Local Folders, my subfolders have subfolders. In both levels of subfolders, Thunderbird has spontaneously started disordering both newly created subfolders, and folders which I move from one subfolder to another using right click 'Move To' Up until ten days ago, all folders whether new or moved, were listed alphabetically. Now, day by day, the disordering is getting worse and as someone with ongoing conversations with hundreds of clients, it is becoming impossible to work when I have to give so much time to slowly scanning through every folder looking for the relevant subfolder. I don't know why I can't update this version, but I tried installing the newest version available (145) and used the 'reset folder option' which did not work either. Also, setting up a whole new account instead of upgrading my existing account is a colossal faff and I'd rather not have to! Aside from manually reordering (also a colossal faff), can anyone suggest something I might be missing in stopping this happening? Thunderbird says I'm on an esr channel, if that helps Thanks