FEATURE REQUEST: Option to remove (or toggle on/off) Quick Move button in message pane header

I love, love, love this extension and it has really improved the speed with which I manage emails and get to inbox zero - thank you! I was wondering, though, if it might be possible to add an option for toggling on/off (or removing) the Quick Move button in the message pane header (where, now, Reply, Reply All, Junk, etc. reside)? It seems redundant to have it if the button is also added to the upper window where the search bar is now (and must be there to quickly move multiple emails at once). On some themes and CSS options, having the Quick Move button in the message pane crowds out everything and moves the header text even further down (see screenshot). Anyway, just a thought. Thanks again!

Start by locating the Quick Move button in the message pane header and the existing button near the search bar in the Thunderbird add-on UI. Trace how user options are exposed, then add a preference that controls only the message-pane button; done means the button can be hidden or shown without removing the upper-window button and the header no longer crowds on affected themes.

Written by the indexing model from the issue text.