My Thunderbird just updated to version 102, and now there is a new feature where we can select multiple dictionaries at once. While I can see situations where this is interesting, in most cases this is not what I want. I mostly send emails in English and sometimes in my native French. When I write in French, I go to dictionaries and select the correct active one. With the new feature, I now have to select French and un-select English, which is an extra click I should not have to do. I looked at the "config editor" but could not locate an option to disable the feature. Why do I not want to use both at the same time? Because there are too many words which are very similar in both languages, and I do not want to miss a typo because that word is recognize in another language than the one I am writing in.