I think this is more a TB working on Mint issue so I post here.
I am running Daryna KDE on a notebook with a 1024x768 panel, and I use an external LCD with 1280x1024, I can display full screen on external except that TB window size locked @ 1024x768 max, all other apps such as Firefox can extent to full screen, is there any way I can release that limit on TB ?
Update : Sorry I mixed up, I shouldn't max the window but use resize to extent it to full screen, this is bit strange but works anyway.
Thunderbird window size - solved
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Thunderbird window size - solved
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Re: Thunderbird window size - solved
Solved? 

" Do Not Do Wrong Twice,That Which You Could Have Done Right The First Time"
Main = HP Pavilion DV4-1275mx - OS=Mint_CE x64KDE/LXDE,& x64Kubuntu