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How to make Thunderbird open with the same pane layout regardless of how it was when I closed it

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I need predictability where I can find it. Thunderbird opens how I left it, so I never know what's going to appear when I start it the next day. Isn't there some setting so that it always opens showing all 3 panes, regardless of my laziness at exit? It would also help with my autohotkey script if it knew what to expect. I suspect the lack of answers in my search suggests there is no such setting. How about a command line argument?

I need predictability where I can find it. Thunderbird opens how I left it, so I never know what's going to appear when I start it the next day. Isn't there some setting so that it always opens showing all 3 panes, regardless of my laziness at exit? It would also help with my autohotkey script if it knew what to expect. I suspect the lack of answers in my search suggests there is no such setting. How about a command line argument?

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