Hello there https://archive.flossmanuals.net/_booki/thunderbird/thunderbird.pdf To read the Thunderbird Floss manual. There is no new (interface is supernova since version 115.0) manual. And/Or I do have this structured / information list with further details after our upgrades and complete updates of the completed version numbers. https://www.thunderbird.net/en-US/thunderbird/releases/ Click on the ''blue text ''to see further information about the fixed subjects for Thunderbird versions after our good upgrades. For the supernova manual , you go to the control panel using that help button or by pressing that f1 button. Caps lock +F1 give s you from within that application that information if you use these buttons. There ain’t one there? I m not sure if I do understand you? if this is not what you re looking for… Questions are open. Greetings googlethunderbird.