05 August 2025 I have used Thunderbird software for many years to manage my e-mail. I am currently using version 140.1.0. Windows 11 OS. I have a gmail e-mail address. I have many subfolders under my "Local Folders". I need to create a new subfolder. I am no longer able to click on "File" and then "New Subfolder" under Local Folders. I think there is an entire ribbon missing from the top of my Thunderbird window. How can I restore the option to click on "File", and then "New Subfolder, so I can create a new subfolder? Thank you. Connie Yanicka