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Thunderbird periodically reconfigures itself and adds reading pane-how do I prevent this and keep my settings?

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I open Thunderbird, and it says "installing updates" or something like that, and then it completely resets my display options. For instance, it opens a reading pane, which I hate. How do I make my settings permanent?

I open Thunderbird, and it says "installing updates" or something like that, and then it completely resets my display options. For instance, it opens a reading pane, which I hate. How do I make my settings permanent?

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Software like CCLEANER is known to reset your settings. If using it or other like software tell it to leave your Thunderbird files alone.