As the title - I've tried everything I can think of but there obviously needs to be a more creative solution. Background info - I use Thunderbird solely for emails and it's really good at doing that (though some of the changes in 78 are really annoying). I don't want a calendar, chat or any of the other extraneous bits as I have long-used software for this elsewhere but can see no option to disable/remove them. Removing the button would be a big start as I often glance down to the bottom right hand corner to see number of emails but the big button is the first thing I see every time.