Karl Skibinski posted a comment on ticket #23

Yes! I would like a way to at least deactivate this button also. The appearance of this button expands the menu-/top-bar within the conversations pane which covers/hides the subject and sender information. Mailredirect 0.10.4 Thunderbird Conversation 2.14.7 Thunderbird 60.2.1 (Linux Ubuntu, current version for Ubuntu 18.04 LTS) Thank you very much! :)