Threads (latest upgrade)
How to turn "threads" off. Options in under Views not clear if the Thread process is off or user can have a mix and match of threaded, unthreaded, or a few of both in the folder. Using the lastest upgrade of T'bird on Win 11.
Alla svar (1)
Threading is at the folder level, so you might have one threaded and another unthreaded. The default is threaded. To change default for new folders, In config editor, you can change default that applies to NEW folders you set up: mailnews.default_view_flags 0=unthreaded
Config editor is available at Tools>settings>general and scroll to bottom right.